Bug#1149109: linux-image-7.1.8+deb13-amd64: amdgpu flip_done timed out and freeze on RX 6600 (regression from 7.1.3)

From	Maksim <sinelnikovma@ya.ru>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1149109: linux-image-7.1.8+deb13-amd64: amdgpu flip_done timed out and freeze on RX 6600 (regression from 7.1.3)
Date	2026-09-26 20:10 +0200
Message-ID	<NHF0u-1XxJ-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: linux-image-7.1.8+deb13-amd64
Version: 7.1.8-1~bpo13+1
Severity: important

Dear Maintainer,

After upgrading to kernel 7.1.8, the system freezes when Alt+Tabbing
out of fullscreen games (tested with Fallout Shelter via Steam/Proton).

dmesg shows:
amdgpu 0000:0a:00.0: [drm] *ERROR* [CRTC:422:crtc-0] flip_done timed out
amdgpu 0000:0a:00.0: [drm] *ERROR* flip_done timed out
amdgpu 0000:0a:00.0: [drm] *ERROR* [CRTC:422:crtc-0] commit wait timed out

Hardware: AMD Radeon RX 6600 (Navi 23), Ryzen 7 5700X,
Gigabyte B550 AORUS ELITE V2 (BIOS FId, 2026-08-18), 128 GB RAM.

Kernel 7.1.3 works fine with same hardware and same games.
The problem is a regression introduced in 7.1.8.

Workaround: revert to kernel 7.1.3 and pin it via apt-mark hold.

I already tried amdgpu.dcdebugmask=0x410 and it did not help.

Note: currently running 7.1.3 (as shown in System Information below),
because 7.1.8 is unusable due to this bug.

-- System Information:
Debian Release: 13.7
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 7.1.3+deb13-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_USER, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-7.1.8+deb13-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.148.4
ii  linux-base                              4.12.1
pn  linux-base-7.1.8+deb13-amd64            <none>
pn  linux-binary-7.1.8+deb13-amd64          <none>
pn  linux-modules-7.1.8+deb13-amd64         <none>

Versions of packages linux-image-7.1.8+deb13-amd64 recommends:
ii  apparmor  4.1.0-1

Versions of packages linux-image-7.1.8+deb13-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  firmware-linux-free     20241210-2
ii  grub-efi-amd64          2.12-9+deb13u2
pn  linux-doc-7.1           <none>

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Bug#1149109: linux-image-7.1.8+deb13-amd64: amdgpu flip_done timed out and freeze on RX 6600 (regression from 7.1.3) Maksim <sinelnikovma@ya.ru> - 2026-09-26 20:10 +0200
  Processed: Re: Bug#1149109: linux-image-7.1.8+deb13-amd64: amdgpu  flip_done timed out and freeze on RX 6600 (regression from 7.1.3) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-10-07 22:00 +0200
  Bug#1149109: linux-image-7.1.8+deb13-amd64: amdgpu flip_done timed out and freeze on RX 6600 (regression from 7.1.3) Salvatore Bonaccorso <carnil@debian.org> - 2026-10-07 22:00 +0200

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