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After installing Ubuntu 26.04 LTS, the display randomly freezes for a
short time, usually a few hundred milliseconds to around one second.
This is most visible in games and video playback, but it can also happen
outside games (e.g. watching a video or just using Ubuntu).
During the freeze, the application/game continues running. For example,
in Counter-Strike 2 or Albion Online, if I am moving when the freeze
happens, after the screen updates again my character is farther ahead.
This suggests the system/game/input are still running, but the
display/presentation stops updating temporarily.
Audio usually continues normally. Very rarely, during longer freezes,
audio repeats/stutters briefly.
This did not happen on the same hardware with Ubuntu 24.04.4, Ubuntu
25.04, or Ubuntu 25.10. It started only on Ubuntu 26.04.
Hardware:
- CPU: AMD Ryzen 7 7700X
- GPU: AMD Radeon RX 7900 XT / Navi 31
- Motherboard: ASRock B650M Pro RS WiFi
- RAM: 32 GB
- Monitors: 2x Dell S2721HS, 1920x1080, 60/74.97 Hz
Software:
- Ubuntu 26.04 LTS
- GNOME Shell 50.1
- Wayland session
- Mutter/libmutter 50.1
- Kernel 7.0.0-15-generic
- Mesa 26.0.3
- RADV/radeonsi
- Xwayland 24.1.10
What I tried:
- Disabled VRR: no change
- Tested 60 Hz and 74.97 Hz: no useful change
- Disabled second monitor: no change
- Disabled all GNOME Shell extensions: no change
- Created a clean new user account and tested there: still freezes
- Disabled Ryzen iGPU so only RX 7900 XT remained visible: still freezes
- Updated motherboard BIOS from 1.30 to 4.20: no change
- Tried amdgpu.dcdebugmask=0x12, 0x20012, 0x20052: no change
- Tried runtime power_dpm_force_performance_level=high: no change
- Tried MUTTER_DEBUG_FORCE_KMS_MODE=simple, MUTTER_DEBUG_KMS_THREAD_TYPE=user,
MUTTER_DEBUG_DISABLE_HW_CURSORS=1: no change
- Tried disabling unredirect/direct scanout through GNOME Looking Glass: no
change
- Kernel logs do not show amdgpu ring timeout or GPU reset during freezes
- dmesg did show repeated AMD display-manager workqueue warnings:
"dm_handle_vmin_vmax_update [amdgpu] hogged CPU for >10000us"
Expected:
The display should continue presenting frames smoothly.
Actual:
The visible display freezes briefly, then jumps forward, while the application
continues running underneath.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: libmutter-18-0 50.1-0ubuntu2
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 30 21:47:54 2026
InstallationDate: Installed on 2026-04-29 (1 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
--
Ubuntu 26.04 GNOME Wayland: random short display/presentation freezes on AMD RX
7900 XT while apps continue running
https://bugs.launchpad.net/bugs/2150776
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