https://bugs.kde.org/show_bug.cgi?id=507133
Bug ID: 507133
Summary: Wayland session freezes on AMDGPU (7900XTX) due to
atomic commit hangs — Plasma 6.3.5 on Debian 13
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Debian testing
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Product: Plasma
Component: Wayland Session / KWin
Version: 6.3.5
Platform: Debian 13 (Trixie), AMDGPU
Description:
I am experiencing frequent compositor freezes under Plasma 6.3.5 Wayland on
Debian 13 (Trixie) with an AMD Radeon RX 7900 XTX.
The freeze symptoms:
Desktop becomes unresponsive
Switching TTY works, but switching back shows a black screen or unresponsive
SDDM
Music and background apps keep running
Requires restarting the session or killing KWin/systemd-logind to recover
This happens during normal desktop usage — such as browsing (Brave Browser) or
file management — and never occurs during gaming.
It is not linked to suspend/resume or frequent TTY switching.
Tested mitigations with no success:
Switching off variable refresh rate (VRR)
Lowering refresh rate from 144 Hz to 120 Hz
Updating to 6.16.0-rc6 mainline kernel with latest linux-firmware
Switching browsers (testing with LibreWolf now)
The kernel consistently logs:
swift
Copy code
WARNING: CPU: X PID: Y at
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:8810
amdgpu_dm_atomic_commit_tail
System Info:
Plasma 6.3.5 on Debian 13 (Wayland session)
AMD Radeon RX 7900 XTX (undervolted, stable in gaming)
Kernel: 6.16.0-rc6 (but issue also observed on 6.15.x)
Firmware: Updated July 2025
AMDGPU driver in kernel (no Mesa patches)
SDDM as display manager
Steps to Reproduce:
Boot into Plasma Wayland session
Open Brave or file manager, perform light desktop usage
Wait for compositor freeze (may take minutes or longer)
Check kernel logs for amdgpu_dm_atomic_commit_tail warnings
Expected Result:
Normal atomic commits without freezing the session
Actual Result:
Session freeze requiring intervention
Additional Notes:
I’m aware of upstream atomic commit/DMUB issues in AMDGPU but filing this here
in case it involves KWin or the Wayland session manager’s interaction with
DRM/KMS.
--
You are receiving this mail because:
You are watching all bug changes.
