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Groups > linux.debian.kernel > #92786 > unrolled thread

Bug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]

Started byxiao sheng wen <atzlinux@debian.org>
First post2026-05-27 12:20 +0200
Last post2026-05-31 12:10 +0200
Articles 4 — 4 participants

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Contents

  Bug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper] xiao sheng wen <atzlinux@debian.org> - 2026-05-27 12:20 +0200
    Bug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper] larryw3i <larryw3i@yeah.net> - 2026-05-28 02:50 +0200
    Bug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper] Uwe Kleine-König <ukleinek@debian.org> - 2026-05-31 09:30 +0200
    Bug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper] Icenowy Zheng <zhengxingda@iscas.ac.cn> - 2026-05-31 12:10 +0200

#92786 — Bug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]

Fromxiao sheng wen <atzlinux@debian.org>
Date2026-05-27 12:20 +0200
SubjectBug#1138033: linux-image-7.1-loong64 dmesg has Call Trace Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
Message-ID<MZjwJ-8fBh-1@gated-at.bofh.it>
Package: src:linux
Version: 7.1~rc5-1~exp1
Severity: normal
X-Debbugs-Cc: debian-loongarch@lists.debian.org, atzlinux@debian.org
User: debian-loongarch@lists.debian.org
Usertags: loong64

Hi,

My loongarch 3A6000 PC dmesg has the following Call Trace:
please see following Kernel log, gpu/drm part.

I don't use GUI now.

Regards,
xiao sheng wen

-- Package-specific info:
** Version:
Linux version 7.1-loong64 (debian-kernel@lists.debian.org) (loongarch64-linux-gnu-gcc-15 (Debian 15.2.0-17) 15.2.0, GNU ld (GNU Binutils for Debian) 2.46) #1 SMP PREEMPT Debian 7.1~rc5-1~exp1 (2026-05-26)

** Command line:
BOOT_IMAGE=/boot/vmlinuz-7.1-loong64 root=UUID=cbec2302-b169-45a7-9450-3d4fb41c8f0b ro quiet

** Tainted: W (512)
 * kernel issued warning

** Kernel log:
May 27 17:53:22 3A6000 kernel: input: HDA Loongson Front Mic as /devices/pci0000:00/0000:00:07.0/sound/card1/input6
May 27 17:53:22 3A6000 kernel: input: HDA Loongson Rear Mic as /devices/pci0000:00/0000:00:07.0/sound/card1/input7
May 27 17:53:22 3A6000 kernel: input: HDA Loongson Line as /devices/pci0000:00/0000:00:07.0/sound/card1/input8
May 27 17:53:22 3A6000 kernel: input: HDA Loongson Line Out as /devices/pci0000:00/0000:00:07.0/sound/card1/input9
May 27 17:53:22 3A6000 kernel: input: HDA Loongson Front Headphone as /devices/pci0000:00/0000:00:07.0/sound/card1/input10
May 27 17:53:22 3A6000 kernel: random: crng init done
May 27 17:53:22 3A6000 kernel: Console: switching to colour dummy device 80x25
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] VRAM: 16384 pages ready
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] GTT: 32768 pages ready
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] lsdc-i2c0(sda pin mask=1, scl pin mask=2) created
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] lsdc-i2c1(sda pin mask=4, scl pin mask=8) created
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] display pipe-0 has HDMI and/or VGA
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] display pipe-1 has HDMI 
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] Total 2 outputs
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] registered irq: 68
May 27 17:53:22 3A6000 kernel: [drm] Initialized loongson 1.0.0 for 0000:00:06.1 on minor 0
May 27 17:53:22 3A6000 kernel: Console: switching to colour frame buffer device 240x67
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] fb0: loongsondrmfb frame buffer device
May 27 17:53:22 3A6000 kernel: ------------[ cut here ]------------
May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] drm_WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev))
May 27 17:53:22 3A6000 kernel: WARNING: drivers/gpu/drm/drm_vblank.c:747 at drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm], CPU#0: kworker/0:1/11
May 27 17:53:22 3A6000 kernel: Modules linked in: snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep loongson tpm_tis_spi drm_ttm_helper tpm_tis_core ttm snd_pcm drm_client_lib drm_kms_helper snd_timer snd i2c_algo_bit soundcore evdev binfmt_misc drm zlib_deflate configfs nfnetlink efivarfs autofs4 ext4 crc16 mbcache jbd2 crc32c_cryptoapi hid_generic usbhid hid ahci ohci_pci libahci xhci_pci ehci_pci xhci_hcd libata ehci_hcd ohci_hcd nvme usbcore r8169 nvme_core scsi_mod realtek nvme_keyring nvme_auth phy_package scsi_common usb_common
May 27 17:53:22 3A6000 kernel: CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.1-loong64 #1 PREEMPTLAZY  Debian 7.1~rc5-1~exp1 
May 27 17:53:22 3A6000 kernel: Hardware name: Loongson Loongson-3A6000-HV-7A2000-1w-V0.1-EVB/Loongson-3A6000-HV-7A2000-1w-EVB-V1.21, BIOS Loongson-UDK2018-V4.0.05756-prestab
May 27 17:53:22 3A6000 kernel: Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
May 27 17:53:22 3A6000 kernel: pc ffff800002f774c4 ra ffff800002f774c4 tp 90000001004c4000 sp 90000001004c7b30
May 27 17:53:22 3A6000 kernel: a0 000000000000004f a1 0000000000000000 a2 90000001004c7920 a3 90000001004c7918
May 27 17:53:22 3A6000 kernel: a4 0000000000000000 a5 90000001004c7af8 a6 2d2d2d2d2d2d2d2d a7 2d2d2d2d2d2d2d2d
May 27 17:53:22 3A6000 kernel: t0 0c403a42ea8ca400 t1 0c403a42ea8ca400 t2 9000000001854000 t3 0000000000000001
May 27 17:53:22 3A6000 kernel: t4 fffffffffffffffe t5 3fffffffffffefff t6 900000000190ece8 t7 0000000000000000
May 27 17:53:22 3A6000 kernel: t8 0000000000000000 u0 ffff800003086000 s9 0000000000000000 s0 900000010006f0d0
May 27 17:53:22 3A6000 kernel: s1 90000001064014b0 s2 ffff800003086000 s3 0000000000000000 s4 ffff800003150900
May 27 17:53:22 3A6000 kernel: s5 90000001004c7c14 s6 0000000000000000 s7 ffffffffffffffff s8 900000010cfa1308
May 27 17:53:22 3A6000 kernel:    ra: ffff800002f774c4 drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
May 27 17:53:22 3A6000 kernel:   ERA: ffff800002f774c4 drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
May 27 17:53:22 3A6000 kernel:  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
May 27 17:53:22 3A6000 kernel:  PRMD: 00000000 (PPLV0 -PIE -PWE)
May 27 17:53:22 3A6000 kernel:  EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
May 27 17:53:22 3A6000 kernel:  ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7)
May 27 17:53:22 3A6000 kernel: ESTAT: 000c0000 [BRK] (IS= ECode=12 EsubCode=0)
May 27 17:53:22 3A6000 kernel:  PRID: 0014d000 (Loongson-64bit, Loongson-3A6000-HV)
May 27 17:53:22 3A6000 kernel: CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.1-loong64 #1 PREEMPTLAZY  Debian 7.1~rc5-1~exp1 
May 27 17:53:22 3A6000 kernel: Hardware name: Loongson Loongson-3A6000-HV-7A2000-1w-V0.1-EVB/Loongson-3A6000-HV-7A2000-1w-EVB-V1.21, BIOS Loongson-UDK2018-V4.0.05756-prestab
May 27 17:53:22 3A6000 kernel: Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
May 27 17:53:22 3A6000 kernel: Stack : 90000001004c7778 0000000000000000 9000000000238c28 90000001004c4000
May 27 17:53:22 3A6000 kernel:         90000001004c7750 90000001004c7758 0000000000000000 90000001004c7898
May 27 17:53:22 3A6000 kernel:         90000001004c7890 90000001004c7890 90000001004c7778 0000000000000024
May 27 17:53:22 3A6000 kernel:         0000000000000030 90000001004c7758 0c403a42ea8ca400 9000000100476440
May 27 17:53:22 3A6000 kernel:         90000001004c4000 900000000160c2e8 3fffffffffffefff 900000000190ece8
May 27 17:53:22 3A6000 kernel:         0000000000000000 0000000000000000 000000087ac30000 0000000000000000
May 27 17:53:22 3A6000 kernel:         0000000000000000 9000000001854000 0000000000000000 900000000160c2e8
May 27 17:53:22 3A6000 kernel:         00000000000002eb 0000000000000009 0000000000000000 ffffffffffffffff
May 27 17:53:22 3A6000 kernel:         900000010cfa1308 0000000000000000 9000000000238c44 00007ffff0e02f70
May 27 17:53:22 3A6000 kernel:         00000000000000b0 0000000000000000 0000000000000000 0000000000071c1d
May 27 17:53:22 3A6000 kernel:         ...
May 27 17:53:22 3A6000 kernel: Call Trace:
May 27 17:53:22 3A6000 kernel: [<9000000000238c44>] show_stack+0x64/0x190
May 27 17:53:22 3A6000 kernel: [<9000000000231248>] dump_stack_lvl+0x70/0x9c
May 27 17:53:22 3A6000 kernel: [<9000000000290278>] __warn+0xa8/0x210
May 27 17:53:22 3A6000 kernel: [<90000000012648e8>] __report_bug+0xa8/0x1c0
May 27 17:53:22 3A6000 kernel: [<9000000001264af0>] report_bug+0x40/0xd0
May 27 17:53:22 3A6000 kernel: [<90000000012a9ed4>] do_bp+0x254/0x420
May 27 17:53:22 3A6000 kernel: [<0000000000000000>] 0x0
May 27 17:53:22 3A6000 kernel: [<ffff800002f774c4>] drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
May 27 17:53:22 3A6000 kernel: [<ffff800002f756b4>] drm_crtc_get_last_vbltimestamp+0x64/0xb0 [drm]
May 27 17:53:22 3A6000 kernel: [<ffff800002f76748>] drm_update_vblank_count+0xb8/0x4a0 [drm]
May 27 17:53:22 3A6000 kernel: [<ffff800002f76d00>] drm_vblank_enable+0x1d0/0x230 [drm]
May 27 17:53:22 3A6000 kernel: [<ffff800002f77eac>] drm_vblank_get+0xdc/0x160 [drm]
May 27 17:53:22 3A6000 kernel: [<ffff800002f7cecc>] drm_client_modeset_wait_for_vblank+0x4c/0xb0 [drm]
May 27 17:53:22 3A6000 kernel: [<ffff8000031f8fd4>] drm_fb_helper_damage_work+0x84/0x240 [drm_kms_helper]
May 27 17:53:22 3A6000 kernel: [<90000000002c0dd4>] process_one_work+0x1a4/0x620
May 27 17:53:22 3A6000 kernel: [<90000000002c1d90>] worker_thread+0x1f0/0x3b0
May 27 17:53:22 3A6000 kernel: [<90000000002cd988>] kthread+0x148/0x160
May 27 17:53:22 3A6000 kernel: [<90000000012aa338>] ret_from_kernel_thread+0x28/0x290
May 27 17:53:22 3A6000 kernel: [<90000000002369e8>] ret_from_kernel_thread_asm+0x10/0x88
May 27 17:53:22 3A6000 kernel: 
May 27 17:53:22 3A6000 kernel: ---[ end trace 0000000000000000 ]---
May 27 17:53:22 3A6000 kernel: EXT4-fs (nvme0n1p4): mounted filesystem ee2f24ea-852b-44ff-a84a-e19682d7eb8c r/w with ordered data mode. Quota mode: none.
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name=4D6F6E676F444220436F6D70617373 pid=485 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="1password" pid=483 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="Discord" pid=484 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="balena-etcher" pid=488 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="brave" pid=489 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="QtWebEngineProcess" pid=486 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.948:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="buildah" pid=490 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.952:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="busybox" pid=492 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.952:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="cam" pid=493 comm="apparmor_parser"
May 27 17:53:22 3A6000 kernel: audit: type=1400 audit(1779875602.952:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="ch-run" pid=495 comm="apparmor_parser"
May 27 17:53:23 3A6000 kernel: device-mapper: core: CONFIG_IMA_DISABLE_HTABLE is disabled. Duplicate IMA measurements will not be recorded in the IMA log.
May 27 17:53:23 3A6000 kernel: device-mapper: uevent: version 1.0.3
May 27 17:53:23 3A6000 kernel: device-mapper: ioctl: 4.50.0-ioctl (2025-04-28) initialised: dm-devel@lists.linux.dev
May 27 17:53:23 3A6000 kernel: NET: Registered PF_QIPCRTR protocol family
May 27 17:53:23 3A6000 kernel: Generic FE-GE Realtek PHY r8169-0-200:00: attached PHY driver (mii_bus:phy_addr=r8169-0-200:00, irq=MAC)
May 27 17:53:23 3A6000 kernel: cfg80211: Loading compiled-in X.509 certificates for regulatory database
May 27 17:53:23 3A6000 kernel: r8169 0000:02:00.0 enp2s0: Link is Down
May 27 17:53:23 3A6000 kernel: Loaded X.509 cert 'benh@debian.org: 577e021cb980e0e820821ba7b54b4961b8b4fadf'
May 27 17:53:23 3A6000 kernel: Loaded X.509 cert 'romain.perier@gmail.com: 3abbc6ec146e09d1b6016ab9d6cf71dd233f0328'
May 27 17:53:23 3A6000 kernel: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
May 27 17:53:23 3A6000 kernel: Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
May 27 17:53:26 3A6000 kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 1Gbps/Full - flow control rx/tx

** Model information

** Configuration for modprobe:
blacklist arkfb
blacklist aty128fb
blacklist atyfb
blacklist cirrusfb
blacklist cyber2000fb
blacklist kyrofb
blacklist matroxfb_base
blacklist mb862xxfb
blacklist neofb
blacklist pm2fb
blacklist pm3fb
blacklist radeonfb
blacklist s3fb
blacklist savagefb
blacklist sisfb
blacklist tdfxfb
blacklist tridentfb
blacklist vt8623fb
options bonding max_bonds=0
options cx88_alsa index=-2
options dummy numdummies=0
options ifb numifbs=0
options snd_atiixp_modem index=-2
options snd_intel8x0m index=-2
options snd_pcsp index=-2
options snd_via82xx_modem index=-2

** Loaded modules:
ahci
autofs4
binfmt_misc
cfg80211
configfs
crc16
crc32c_cryptoapi
dm_mod
drm
drm_client_lib
drm_kms_helper
drm_ttm_helper
efivarfs
ehci_hcd
ehci_pci
evdev
ext4
fat
hid
hid_generic
i2c_algo_bit
jbd2
libahci
libata
loongson
mbcache
nfnetlink
nls_ascii
nls_cp437
nvme
nvme_auth
nvme_core
nvme_keyring
ohci_hcd
ohci_pci
phy_package
qrtr
r8169
realtek
rfkill
scsi_common
scsi_mod
snd
snd_hda_codec
snd_hda_codec_conexant
snd_hda_codec_generic
snd_hda_codec_hdmi
snd_hda_core
snd_hda_intel
snd_hwdep
snd_intel_dspcfg
snd_pcm
snd_timer
soundcore
tpm_tis_core
tpm_tis_spi
ttm
usb_common
usbcore
usbhid
vfat
xhci_hcd
xhci_pci
zlib_deflate

** Out of tree modules:
None found

** PCI devices:
0000:00:00.0 Host bridge [0600]: Loongson Technology LLC 7A1000 Chipset Hyper Transport Bridge Controller [0014:7a00]
	Subsystem: Loongson Technology LLC 7A1000 Chipset Hyper Transport Bridge Controller [0014:7a00]
0000:00:00.1 Host bridge [0600]: Loongson Technology LLC 7A2000 Chipset Hyper Transport Bridge Controller [0014:7a10] (rev 01)
0000:00:00.2 Host bridge [0600]: Loongson Technology LLC Device [0014:7a20] (rev 01)
0000:00:00.3 Host bridge [0600]: Loongson Technology LLC Device [0014:7a30]
0000:00:04.0 USB controller [0c03]: Loongson Technology LLC 2K1000 / 7A1000/2000 Chipset USB OHCI Controller [0014:7a24] (rev 02)
	Kernel driver in use: ohci-pci
	Kernel modules: ohci_pci
0000:00:04.1 USB controller [0c03]: Loongson Technology LLC 2K1000 / 7A1000/2000 Chipset USB EHCI Controller [0014:7a14] (rev 02)
	Kernel driver in use: ehci-pci
	Kernel modules: ehci_pci
0000:00:05.0 USB controller [0c03]: Loongson Technology LLC 2K1000 / 7A1000/2000 Chipset USB OHCI Controller [0014:7a24] (rev 02)
	Kernel driver in use: ohci-pci
	Kernel modules: ohci_pci
0000:00:05.1 USB controller [0c03]: Loongson Technology LLC 2K1000 / 7A1000/2000 Chipset USB EHCI Controller [0014:7a14] (rev 02)
	Kernel driver in use: ehci-pci
	Kernel modules: ehci_pci
0000:00:06.0 Multimedia video controller [0400]: Loongson Technology LLC 2K2000 / 7A2000 Chipset LG100 GPU [0014:7a25] (rev 01)
0000:00:06.1 VGA compatible controller [0300]: Loongson Technology LLC 2K2000 / 7A2000 Chipset Display Controller [0014:7a36] (rev 02)
	Kernel driver in use: loongson
	Kernel modules: loongson
0000:00:06.2 Audio device [0403]: Loongson Technology LLC 2K2000/3000 / 3B6000M HDMI Audio Controller [0014:7a37]
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel
0000:00:07.0 Audio device [0403]: Loongson Technology LLC 2K1000/2000/3000 / 3B6000M / 7A1000/2000 Chipset HD Audio Controller [0014:7a07]
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel
0000:00:08.0 SATA controller [0106]: Loongson Technology LLC 2K2000/3000 / 3B6000M / 7A2000 Chipset 6Gb/s SATA AHCI Controller [0014:7a18]
	Kernel driver in use: ahci
	Kernel modules: ahci
0000:00:09.0 PCI bridge [0604]: Loongson Technology LLC 2K2000 / 7A2000 Chipset PCIe x4 Root Port [0014:7a49]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:0a.0 PCI bridge [0604]: Loongson Technology LLC 2K2000 / 7A2000 Chipset PCIe x1 Root Port [0014:7a39]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:0b.0 PCI bridge [0604]: Loongson Technology LLC 2K2000 / 7A2000 Chipset PCIe x1 Root Port [0014:7a39]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:0c.0 PCI bridge [0604]: Loongson Technology LLC 2K2000 / 7A2000 Chipset PCIe x1 Root Port [0014:7a39]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:0d.0 PCI bridge [0604]: Loongson Technology LLC 2K2000 / 7A2000 Chipset PCIe x4 Root Port [0014:7a49]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:0f.0 PCI bridge [0604]: Loongson Technology LLC 7A2000 Chipset PCIe x16 Root Port [0014:7a69]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:10.0 PCI bridge [0604]: Loongson Technology LLC 7A2000 Chipset PCIe x8 Root Port [0014:7a59]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:13.0 PCI bridge [0604]: Loongson Technology LLC 7A2000 Chipset PCIe x8 Root Port [0014:7a59]
	Kernel driver in use: pcieport
	Kernel modules: shpchp
0000:00:16.0 System peripheral [0880]: Loongson Technology LLC 2K2000/3000 / 3B6000M / 7A2000 Chipset SPI Controller [0014:7a1b]
0000:00:19.0 USB controller [0c03]: Loongson Technology LLC 2K2000/3000 / 3B6000M / 7A2000 Chipset USB 3.0 xHCI Controller [0014:7a34]
	Kernel driver in use: xhci_hcd
	Kernel modules: xhci_pci
0000:00:0a.0/02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
	Subsystem: Realtek Semiconductor Co., Ltd. Device [10ec:0123]
	Kernel driver in use: r8169
	Kernel modules: r8169
0000:00:0d.0/05:00.0 Non-Volatile memory controller [0108]: Jiangsu Xinsheng Intelligent Technology Co., Ltd EP2000Pro PCIe 3 NVMe SSD (DRAM-less) [1e68:8111] (rev 01)
	Subsystem: Jiangsu Xinsheng Intelligent Technology Co., Ltd Device [1e68:0000]
	Kernel driver in use: nvme
	Kernel modules: nvme

** USB devices:
/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=ehci-pci/4p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=ehci-pci/4p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    |__ Port 003: Dev 003, If 0, Class=Hub, Driver=hub/5p, 480M
        ID 0bda:5409 Realtek Semiconductor Corp. 
        |__ Port 005: Dev 004, If 0, Class=Human Interface Device, Driver=usbhid, 480M
            ID 0bda:1100 Realtek Semiconductor Corp. 
/:  Bus 003.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
/:  Bus 004.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 5000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub
/:  Bus 005.Port 001: Dev 001, Class=root_hub, Driver=ohci-pci/4p, 12M
    ID 1d6b:0001 Linux Foundation 1.1 root hub
    |__ Port 002: Dev 002, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        ID 046a:0011 CHERRY G83 (RS 6000) Keyboard
/:  Bus 006.Port 001: Dev 001, Class=root_hub, Driver=ohci-pci/4p, 12M
    ID 1d6b:0001 Linux Foundation 1.1 root hub
    |__ Port 001: Dev 002, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        ID 30fa:0300  


-- System Information:
Debian Release: forky/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: loong64 (loongarch64)

Kernel: Linux 7.1-loong64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_WARN
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-7.1-loong64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.151
ii  linux-base                              4.15
ii  linux-base-7.1-loong64                  7.1~rc5-1~exp1
ii  linux-binary-7.1-loong64                7.1~rc5-1~exp1
ii  linux-modules-7.1-loong64               7.1~rc5-1~exp1

Versions of packages linux-image-7.1-loong64 recommends:
ii  apparmor  4.1.7-2

Versions of packages linux-image-7.1-loong64 suggests:
pn  debian-kernel-handbook  <none>
pn  firmware-linux-free     <none>
pn  linux-doc-7.1           <none>

Versions of packages linux-image-7.1-loong64 is related to:
pn  firmware-amd-graphics      <none>
pn  firmware-atheros           <none>
pn  firmware-bnx2              <none>
pn  firmware-bnx2x             <none>
pn  firmware-brcm80211         <none>
pn  firmware-cavium            <none>
pn  firmware-cirrus            <none>
pn  firmware-intel-graphics    <none>
pn  firmware-intel-misc        <none>
pn  firmware-intel-sound       <none>
pn  firmware-ipw2x00           <none>
pn  firmware-ivtv              <none>
pn  firmware-iwlwifi           <none>
pn  firmware-libertas          <none>
pn  firmware-marvell-prestera  <none>
pn  firmware-mediatek          <none>
pn  firmware-misc-nonfree      <none>
pn  firmware-myricom           <none>
pn  firmware-netronome         <none>
pn  firmware-netxen            <none>
pn  firmware-nvidia-graphics   <none>
pn  firmware-qcom-soc          <none>
pn  firmware-qlogic            <none>
ii  firmware-realtek           20260410-1
pn  firmware-samsung           <none>
pn  firmware-siano             <none>
pn  firmware-ti-connectivity   <none>
pn  xen-hypervisor             <none>

-- no debconf information

[toc] | [next] | [standalone]

#92799

Fromlarryw3i <larryw3i@yeah.net>
Date2026-05-28 02:50 +0200
Message-ID<MZx6F-8oKb-3@gated-at.bofh.it>
In reply to#92786
This issue also effects me.

```

May 24 21:10:24 loong0 kernel: input: Telink Wireless Receiver as 
/devices/pci0000:00/0000:00:05.0/usb6/6-2/6-2:1.1/0003:248A:8327.0002/input/input4
May 24 21:10:24 loong0 kernel: hid-generic 0003:248A:8327.0002: 
input,hidraw1: USB HID v1.11 Keyboard [Telink Wireless Receiver] on 
usb-0000:00:05.0-2/input1
May 24 21:10:24 loong0 kernel: Console: switching to colour frame buffer 
device 240x67
May 24 21:10:24 loong0 kernel: ------------[ cut here ]------------
May 24 21:10:24 loong0 kernel: loongson 0000:00:06.1: [drm] 
drm_WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev))
May 24 21:10:24 loong0 kernel: WARNING: drivers/gpu/drm/drm_vblank.c:747 
at drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 
[drm], CPU#0: kworker/0:2/230
May 24 21:10:24 loong0 kernel: Modules linked in: hid_generic usbhid hid 
loongson(+) i2c_algo_bit drm_ttm_helper ttm drm_client_lib 
drm_kms_helper ahci libahci xhci_pci ohci_pci xhci_hcd drm libata nvme 
dwmac_loongson ehci_pci stmmac_libpci nvme_core ehci_hcd ohci_hcd stmmac 
usbcore scsi_mod nvme_keyring nvme_auth pcs_xpcs zlib_deflate hkdf 
phylink usb_common scsi_com>
May 24 21:10:24 loong0 kernel: CPU: 0 UID: 0 PID: 230 Comm: kworker/0:2 
Not tainted 7.0.7+deb14-loong64 #1 PREEMPTLAZY  Debian 7.0.7-1
May 24 21:10:24 loong0 kernel: Hardware name: Loongson 
CTCI02LS3A6000C-K/CTCI02LS3A6000C-K, BIOS 
Loongson-UDK2018-V4.0.05692-CTCI02202408 08/09/24 14:08:25
May 24 21:10:24 loong0 kernel: Workqueue: events 
drm_fb_helper_damage_work [drm_kms_helper]
May 24 21:10:24 loong0 kernel: pc ffff800002ae2e04 ra ffff800002ae2e04 
tp 900000011de4c000 sp 900000011de4fb40
May 24 21:10:24 loong0 kernel: a0 000000000000004f a1 0000000000000000 
a2 0000000000000040 a3 ffffffffffffffff
May 24 21:10:24 loong0 kernel: a4 ffff800002d4cbe0 a5 900000011de4fb08 
a6 2d2d2d2d2d2d2d2d a7 2d2d2d2d2d2d2d2d
May 24 21:10:24 loong0 kernel: t0 9996471fcb7d3dff t1 9996471fcb7d3dff 
t2 9000000001814000 t3 0000000000000001
May 24 21:10:24 loong0 kernel: t4 40000000fffff26f t5 90000000018cf310 
t6 00000000fffff26f t7 90000000018b6eb8
May 24 21:10:24 loong0 kernel: t8 000000000000003f u0 0000000000000000 
s9 0000000000000000 s0 90000001061cc8b0
May 24 21:10:24 loong0 kernel: s1 ffff800002d51000 s2 0000000000000000 
s3 ffff800002624900 s4 900000011de4fc24
May 24 21:10:24 loong0 kernel: s5 900000010006d0d0 s6 00000000000003cf 
s7 ffffffffffffffff s8 900000011f970fc8
May 24 21:10:24 loong0 kernel:    ra: ffff800002ae2e04 
drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
May 24 21:10:24 loong0 kernel:   ERA: ffff800002ae2e04 
drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
May 24 21:10:24 loong0 kernel:  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC 
DACM=CC -WE)
May 24 21:10:24 loong0 kernel:  PRMD: 00000000 (PPLV0 -PIE -PWE)
May 24 21:10:24 loong0 kernel:  EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
May 24 21:10:24 loong0 kernel:  ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7)
May 24 21:10:24 loong0 kernel: ESTAT: 000c0000 [BRK] (IS= ECode=12 
EsubCode=0)
May 24 21:10:24 loong0 kernel:  PRID: 0014d000 (Loongson-64bit, 
Loongson-3A6000)
May 24 21:10:24 loong0 kernel: CPU: 0 UID: 0 PID: 230 Comm: kworker/0:2 
Not tainted 7.0.7+deb14-loong64 #1 PREEMPTLAZY  Debian 7.0.7-1
May 24 21:10:24 loong0 kernel: Hardware name: Loongson 
CTCI02LS3A6000C-K/CTCI02LS3A6000C-K, BIOS 
Loongson-UDK2018-V4.0.05692-CTCI02202408 08/09/24 14:08:25
May 24 21:10:24 loong0 kernel: Workqueue: events 
drm_fb_helper_damage_work [drm_kms_helper]
May 24 21:10:24 loong0 kernel: Stack : 900000011de4f788 0000000000000000 
9000000000238c28 900000011de4c000
May 24 21:10:24 loong0 kernel:         900000011de4f760 900000011de4f768 
0000000000000000 900000011de4f8a8
May 24 21:10:24 loong0 kernel:         900000011de4f8a0 900000011de4f8a0 
900000011de4f788 0000000000000024
May 24 21:10:24 loong0 kernel:         0000000000000030 900000011de4f768 
9996471fcb7d3dff 900000011c1d1580
May 24 21:10:24 loong0 kernel:         900000011de4c000 90000000015f6c10 
00000000ffffefff 90000000018ceeb8
May 24 21:10:24 loong0 kernel:         0000000000000000 0000000000000000 
000000087ac48000 0000000000000000
May 24 21:10:24 loong0 kernel:         0000000000000000 9000000001814000 
0000000000000000 90000000015f6c10
May 24 21:10:24 loong0 kernel:         00000000000002eb 0000000000000009 
00000000000003cf ffffffffffffffff
May 24 21:10:24 loong0 kernel:         900000011f970fc8 0000000000000000 
9000000000238c44 00007ffff27506b4
May 24 21:10:24 loong0 kernel:         00000000000000b0 0000000000000000 
0000000000000000 0000000000071c1d
May 24 21:10:24 loong0 kernel:         ...
May 24 21:10:24 loong0 kernel: Call Trace:
May 24 21:10:24 loong0 kernel: [<9000000000238c44>] show_stack+0x64/0x190
May 24 21:10:24 loong0 kernel: [<9000000000230ef8>] dump_stack_lvl+0x70/0x9c
May 24 21:10:24 loong0 kernel: [<900000000028f670>] __warn+0xa0/0x210
May 24 21:10:24 loong0 kernel: [<900000000125c8e8>] __report_bug+0xa8/0x1c0
May 24 21:10:24 loong0 kernel: [<900000000125caf0>] report_bug+0x40/0xd0
May 24 21:10:24 loong0 kernel: [<900000000129f9b4>] do_bp+0x254/0x420
May 24 21:10:24 loong0 kernel: [<0000000000000000>] 0x0
May 24 21:10:24 loong0 kernel: [<ffff800002ae2e04>] 
drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
May 24 21:10:24 loong0 kernel: [<ffff800002ae1014>] 
drm_crtc_get_last_vbltimestamp+0x64/0xb0 [drm]
May 24 21:10:24 loong0 kernel: [<ffff800002ae20a0>] 
drm_update_vblank_count+0xb0/0x480 [drm]
May 24 21:10:24 loong0 kernel: [<ffff800002ae2640>] 
drm_vblank_enable+0x1d0/0x230 [drm]
May 24 21:10:24 loong0 kernel: [<ffff800002ae37ec>] 
drm_vblank_get+0xdc/0x160 [drm]
May 24 21:10:24 loong0 kernel: [<ffff800002ae880c>] 
drm_client_modeset_wait_for_vblank+0x4c/0xb0 [drm]
May 24 21:10:24 loong0 kernel: [<ffff800002738eb4>] 
drm_fb_helper_damage_work+0x84/0x240 [drm_kms_helper]
May 24 21:10:24 loong0 kernel: [<90000000002c0354>] 
process_one_work+0x1a4/0x640
May 24 21:10:24 loong0 kernel: [<90000000002c1330>] 
worker_thread+0x1f0/0x3c0
May 24 21:10:24 loong0 kernel: [<90000000002cce68>] kthread+0x148/0x160
May 24 21:10:24 loong0 kernel: [<900000000129fe18>] 
ret_from_kernel_thread+0x28/0x290
May 24 21:10:24 loong0 kernel: [<90000000002369e8>] 
ret_from_kernel_thread_asm+0x10/0x88
May 24 21:10:24 loong0 kernel:
May 24 21:10:24 loong0 kernel: ---[ end trace 0000000000000000 ]---
May 24 21:10:24 loong0 kernel: loongson 0000:00:06.1: [drm] fb0: 
loongsondrmfb frame buffer device
May 24 21:10:24 loong0 kernel: random: crng init done
May 24 21:10:24 loong0 kernel: device-mapper: core: 
CONFIG_IMA_DISABLE_HTABLE is disabled. Duplicate IMA measurements will 
not be recorded in the IMA log.
May 24 21:10:24 loong0 kernel: device-mapper: uevent: version 1.0.3
May 24 21:10:24 loong0 kernel: device-mapper: ioctl: 4.50.0-ioctl 
(2025-04-28) initialised: dm-devel@lists.linux.dev
May 24 21:10:24 loong0 kernel: PM: Image not found (code -22)
May 24 21:10:24 loong0 kernel: EXT4-fs (dm-0): orphan cleanup on readonly fs
May 24 21:10:24 loong0 kernel: EXT4-fs (dm-0): mounted filesystem 
0acd0998-bf0a-4e8b-a891-552bc0306488 ro with ordered data mode. Quota 
mode: none.

```

My 3A6000 NUC host has two HDMI ports. When one port is connected to a 
monitor, everything is normal (without the issue mentioned above). 
However, when the other port is connected to a monitor, the issue 
mentioned in the log above occurs. (Even though the host can still start 
normally and enter the desktop environment after `systemd journal` printed.)

Hope you guys fix it soon.

Regards,

larryw3i

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#92869

FromUwe Kleine-König <ukleinek@debian.org>
Date2026-05-31 09:30 +0200
Message-ID<N0IMq-9dkn-1@gated-at.bofh.it>
In reply to#92786

[Multipart message — attachments visible in raw view] — view raw

[I fatfingered the from header in my first try to send this email. I
guess it was refused by most mail servers, please excuse if you get this
mail twice. Please use this one to reply to.]

Hello,

On Wed, May 27, 2026 at 06:17:51PM +0800, xiao sheng wen wrote:
> Package: src:linux
> Version: 7.1~rc5-1~exp1
> Severity: normal
> X-Debbugs-Cc: debian-loongarch@lists.debian.org, atzlinux@debian.org
> User: debian-loongarch@lists.debian.org
> Usertags: loong64
> 
> Hi,
> 
> My loongarch 3A6000 PC dmesg has the following Call Trace:
> please see following Kernel log, gpu/drm part.
> [...]
> May 27 17:53:22 3A6000 kernel: [drm] Initialized loongson 1.0.0 for 0000:00:06.1 on minor 0
> May 27 17:53:22 3A6000 kernel: Console: switching to colour frame buffer device 240x67
> May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] fb0: loongsondrmfb frame buffer device
> May 27 17:53:22 3A6000 kernel: ------------[ cut here ]------------
> May 27 17:53:22 3A6000 kernel: loongson 0000:00:06.1: [drm] drm_WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev))
> May 27 17:53:22 3A6000 kernel: WARNING: drivers/gpu/drm/drm_vblank.c:747 at drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm], CPU#0: kworker/0:1/11
> May 27 17:53:22 3A6000 kernel: Modules linked in: snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep loongson tpm_tis_spi drm_ttm_helper tpm_tis_core ttm snd_pcm drm_client_lib drm_kms_helper snd_timer snd i2c_algo_bit soundcore evdev binfmt_misc drm zlib_deflate configfs nfnetlink efivarfs autofs4 ext4 crc16 mbcache jbd2 crc32c_cryptoapi hid_generic usbhid hid ahci ohci_pci libahci xhci_pci ehci_pci xhci_hcd libata ehci_hcd ohci_hcd nvme usbcore r8169 nvme_core scsi_mod realtek nvme_keyring nvme_auth phy_package scsi_common usb_common
> May 27 17:53:22 3A6000 kernel: CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.1-loong64 #1 PREEMPTLAZY  Debian 7.1~rc5-1~exp1 
> May 27 17:53:22 3A6000 kernel: Hardware name: Loongson Loongson-3A6000-HV-7A2000-1w-V0.1-EVB/Loongson-3A6000-HV-7A2000-1w-EVB-V1.21, BIOS Loongson-UDK2018-V4.0.05756-prestab
> May 27 17:53:22 3A6000 kernel: Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
> May 27 17:53:22 3A6000 kernel: pc ffff800002f774c4 ra ffff800002f774c4 tp 90000001004c4000 sp 90000001004c7b30
> May 27 17:53:22 3A6000 kernel: a0 000000000000004f a1 0000000000000000 a2 90000001004c7920 a3 90000001004c7918
> May 27 17:53:22 3A6000 kernel: a4 0000000000000000 a5 90000001004c7af8 a6 2d2d2d2d2d2d2d2d a7 2d2d2d2d2d2d2d2d
> May 27 17:53:22 3A6000 kernel: t0 0c403a42ea8ca400 t1 0c403a42ea8ca400 t2 9000000001854000 t3 0000000000000001
> May 27 17:53:22 3A6000 kernel: t4 fffffffffffffffe t5 3fffffffffffefff t6 900000000190ece8 t7 0000000000000000
> May 27 17:53:22 3A6000 kernel: t8 0000000000000000 u0 ffff800003086000 s9 0000000000000000 s0 900000010006f0d0
> May 27 17:53:22 3A6000 kernel: s1 90000001064014b0 s2 ffff800003086000 s3 0000000000000000 s4 ffff800003150900
> May 27 17:53:22 3A6000 kernel: s5 90000001004c7c14 s6 0000000000000000 s7 ffffffffffffffff s8 900000010cfa1308
> May 27 17:53:22 3A6000 kernel:    ra: ffff800002f774c4 drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
> May 27 17:53:22 3A6000 kernel:   ERA: ffff800002f774c4 drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
> May 27 17:53:22 3A6000 kernel:  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
> May 27 17:53:22 3A6000 kernel:  PRMD: 00000000 (PPLV0 -PIE -PWE)
> May 27 17:53:22 3A6000 kernel:  EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
> May 27 17:53:22 3A6000 kernel:  ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7)
> May 27 17:53:22 3A6000 kernel: ESTAT: 000c0000 [BRK] (IS= ECode=12 EsubCode=0)
> May 27 17:53:22 3A6000 kernel:  PRID: 0014d000 (Loongson-64bit, Loongson-3A6000-HV)
> May 27 17:53:22 3A6000 kernel: CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.1-loong64 #1 PREEMPTLAZY  Debian 7.1~rc5-1~exp1 
> May 27 17:53:22 3A6000 kernel: Hardware name: Loongson Loongson-3A6000-HV-7A2000-1w-V0.1-EVB/Loongson-3A6000-HV-7A2000-1w-EVB-V1.21, BIOS Loongson-UDK2018-V4.0.05756-prestab
> May 27 17:53:22 3A6000 kernel: Workqueue: events drm_fb_helper_damage_work [drm_kms_helper]
> May 27 17:53:22 3A6000 kernel: Stack : 90000001004c7778 0000000000000000 9000000000238c28 90000001004c4000
> May 27 17:53:22 3A6000 kernel:         90000001004c7750 90000001004c7758 0000000000000000 90000001004c7898
> May 27 17:53:22 3A6000 kernel:         90000001004c7890 90000001004c7890 90000001004c7778 0000000000000024
> May 27 17:53:22 3A6000 kernel:         0000000000000030 90000001004c7758 0c403a42ea8ca400 9000000100476440
> May 27 17:53:22 3A6000 kernel:         90000001004c4000 900000000160c2e8 3fffffffffffefff 900000000190ece8
> May 27 17:53:22 3A6000 kernel:         0000000000000000 0000000000000000 000000087ac30000 0000000000000000
> May 27 17:53:22 3A6000 kernel:         0000000000000000 9000000001854000 0000000000000000 900000000160c2e8
> May 27 17:53:22 3A6000 kernel:         00000000000002eb 0000000000000009 0000000000000000 ffffffffffffffff
> May 27 17:53:22 3A6000 kernel:         900000010cfa1308 0000000000000000 9000000000238c44 00007ffff0e02f70
> May 27 17:53:22 3A6000 kernel:         00000000000000b0 0000000000000000 0000000000000000 0000000000071c1d
> May 27 17:53:22 3A6000 kernel:         ...
> May 27 17:53:22 3A6000 kernel: Call Trace:
> May 27 17:53:22 3A6000 kernel: [<9000000000238c44>] show_stack+0x64/0x190
> May 27 17:53:22 3A6000 kernel: [<9000000000231248>] dump_stack_lvl+0x70/0x9c
> May 27 17:53:22 3A6000 kernel: [<9000000000290278>] __warn+0xa8/0x210
> May 27 17:53:22 3A6000 kernel: [<90000000012648e8>] __report_bug+0xa8/0x1c0
> May 27 17:53:22 3A6000 kernel: [<9000000001264af0>] report_bug+0x40/0xd0
> May 27 17:53:22 3A6000 kernel: [<90000000012a9ed4>] do_bp+0x254/0x420
> May 27 17:53:22 3A6000 kernel: [<0000000000000000>] 0x0
> May 27 17:53:22 3A6000 kernel: [<ffff800002f774c4>] drm_crtc_vblank_helper_get_vblank_timestamp_internal+0x3d4/0x450 [drm]
> May 27 17:53:22 3A6000 kernel: [<ffff800002f756b4>] drm_crtc_get_last_vbltimestamp+0x64/0xb0 [drm]
> May 27 17:53:22 3A6000 kernel: [<ffff800002f76748>] drm_update_vblank_count+0xb8/0x4a0 [drm]
> May 27 17:53:22 3A6000 kernel: [<ffff800002f76d00>] drm_vblank_enable+0x1d0/0x230 [drm]
> May 27 17:53:22 3A6000 kernel: [<ffff800002f77eac>] drm_vblank_get+0xdc/0x160 [drm]
> May 27 17:53:22 3A6000 kernel: [<ffff800002f7cecc>] drm_client_modeset_wait_for_vblank+0x4c/0xb0 [drm]
> May 27 17:53:22 3A6000 kernel: [<ffff8000031f8fd4>] drm_fb_helper_damage_work+0x84/0x240 [drm_kms_helper]
> May 27 17:53:22 3A6000 kernel: [<90000000002c0dd4>] process_one_work+0x1a4/0x620
> May 27 17:53:22 3A6000 kernel: [<90000000002c1d90>] worker_thread+0x1f0/0x3b0
> May 27 17:53:22 3A6000 kernel: [<90000000002cd988>] kthread+0x148/0x160
> May 27 17:53:22 3A6000 kernel: [<90000000012aa338>] ret_from_kernel_thread+0x28/0x290
> May 27 17:53:22 3A6000 kernel: [<90000000002369e8>] ret_from_kernel_thread_asm+0x10/0x88
> May 27 17:53:22 3A6000 kernel: 
> May 27 17:53:22 3A6000 kernel: ---[ end trace 0000000000000000 ]---

There is an at least similar issue addressed upstream at
https://lore.kernel.org/dri-devel/20260321092804.3519447-1-zhengxingda@iscas.ac.cn/

That patch wasn't accepted, there is a newer patch under discussion by
the same author, but I'm unsure if that is the continuation of
addressing this issue:
https://lore.kernel.org/dri-devel/20260519092420.1124348-1-zhengxingda@iscas.ac.cn/

@Icenowy: Is that the same issue that you're addressing in the currently
discussed patch? If yes, can you please add

        Closes: https://bugs.debian.org/1138033

to the next revision to simplify tracking for us (= debian-kernel team)?

Best regards
Uwe

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#92872

FromIcenowy Zheng <zhengxingda@iscas.ac.cn>
Date2026-05-31 12:10 +0200
Message-ID<N0Lhg-9f1l-19@gated-at.bofh.it>
In reply to#92786
在 2026-05-31日的 08:49 +0200，Uwe Kleine-König写道：

> That patch wasn't accepted, there is a newer patch under discussion
> by
> the same author, but I'm unsure if that is the continuation of
> addressing this issue:
> https://lore.kernel.org/dri-devel/20260519092420.1124348-1-zhengxingda@iscas.ac.cn/

Yes, this is trying to address the same issue; however it seems that
fbdev emulation is some kind of rabbit hole difficult to address, and I
start to doubt whether this fix is correct (but at least the previous
change to drm/loongson is surely wrong).

> 
> @Icenowy: Is that the same issue that you're addressing in the
> currently
> discussed patch? If yes, can you please add
> 
> 	Closes: https://bugs.debian.org/1138033

Okay, I will add this in the next revision.

Thanks,
Icenowy

> 
> to the next revision to simplify tracking for us (= debian-kernel
> team)?
> 
> Best regards
> Uwe

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