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Bug#945771: random freezes with linux-image 4.19 and 5.2

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  Bug#945771: random freezes with linux-image 4.19 and 5.2 Juha Heinanen <jh@tutpro.com> - 2019-11-28 13:00 +0100
    Bug#945771: found possible fix Juha Heinanen <jh@tutpro.com> - 2019-11-29 03:10 +0100

#65747 — Bug#945771: random freezes with linux-image 4.19 and 5.2

Package: linux-image-4.19.0-6-amd64 and linux-image-5.2.0-0.bpo.3-amd64
Version: 4.9.189-3+deb9u1 and 5.2.17-1~bpo10+1

After upgrading Debian 9 to Debian 10 on my Acer C740 laptop and on my
Gigabyte GB-BXCE-3205 barebone, I have experienced random freezes a few
times per day.  When freeze happens, user interface becomes completely
unresponsive, but the host still responds to ping (but not to ssh).
There is no messages in syslog that would give hints on what happened.
I also tried 5.2 linux-image from Buster backports and experienced the
same freezes.  Reboot via power down/power up is needed in order to
recover from a freeze.

These two hosts have the same Intel CPU Celeron(R) 3205U @ 1.50GHz
(lscpu and lspci from both is below).

So I had to downgrade linux-image to 4.9 from Debian Stretch and it
works on both hosts without freezes.

Any hints on how to debug this would be appreciated.

-- Juha

-------------------- Acer C740

$ lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
Address sizes:       39 bits physical, 48 bits virtual
CPU(s):              2
On-line CPU(s) list: 0,1
Thread(s) per core:  1
Core(s) per socket:  2
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               61
Model name:          Intel(R) Celeron(R) 3205U @ 1.50GHz
Stepping:            4
CPU MHz:             1499.908
CPU max MHz:         1500.0000
CPU min MHz:         500.0000
BogoMIPS:            2992.82
Virtualization:      VT-x
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            2048K
NUMA node0 CPU(s):   0,1
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm 3dnowprefetch epb invpcid_single kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid rdseed intel_pt xsaveopt dtherm ida arat pln pts

$ lspci
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 08)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics (rev 08)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 08)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
01:00.0 Network controller: Intel Corporation Wireless 7260 (rev cb)

-------------------- Gigabyte

$ lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
Address sizes:       39 bits physical, 48 bits virtual
CPU(s):              2
On-line CPU(s) list: 0,1
Thread(s) per core:  1
Core(s) per socket:  2
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               61
Model name:          Intel(R) Celeron(R) 3205U @ 1.50GHz
Stepping:            4
CPU MHz:             799.987
CPU max MHz:         1500.0000
CPU min MHz:         500.0000
BogoMIPS:            2993.28
Virtualization:      VT-x
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            2048K
NUMA node0 CPU(s):   0,1
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm 3dnowprefetch epb invpcid_single kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid rdseed intel_pt xsaveopt dtherm ida arat pln pts

$ lspci
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 08)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics (rev 08)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 08)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
02:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

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#65750 — Bug#945771: found possible fix

After reporting the bug, I found this article:

https://hobo.house/2018/05/18/fix-for-intel-i915-gpu-freeze-on-recent-linux-kernels/

and tried what is suggested, i.e., added file

cat > /etc/X11/xorg.conf.d/10-intel.conf <<EOF
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
EndSection
EOF

After that I have not experienced any freezes (yet).

Would it be possible that in this kind of environment Debian would
automatically use Intel driver instead of X.Org driver?

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