The system is running Debian 13.6 with KDE Plasma on Wayland and an AMD Radeon PRO W6600 (Navi 23, PCI ID 1002:73e3).

During normal desktop use, without changing the display configuration, the middle DisplayPort monitor suddenly stopped updating while the two side monitors continued operating normally. The affected display remained enabled and connected according to `kscreen-doctor`.

Display configuration at the time:

* DP-2: 3840x2160 @ 60 Hz, HDR enabled
* DP-3: 2560x1440 @ 165 Hz — affected/frozen display
* DP-4: 3840x2160 @ 60 Hz, HDR enabled

At 00:25:46 on 2026-08-25 the kernel logged:

```
amdgpu 0000:03:00.0: [drm] *ERROR* [CRTC:89:crtc-1] flip_done timed out
```

At exactly the same time KWin Wayland began repeatedly reporting:

```
kwin_wayland_drm: Pageflip timed out! This is a bug in the amdgpu kernel driver
```

The other two displays initially remained functional while DP-3 continued showing a frozen framebuffer.

After collecting diagnostic logs, I attempted to recover only the affected display using `kscreen-doctor`. The already-stalled display pipeline did not recover.

At 00:33:50 the kernel logged:

```
amdgpu 0000:03:00.0: [drm] *ERROR* flip_done timed out
amdgpu 0000:03:00.0: [drm] *ERROR* [CRTC:89:crtc-1] commit wait timed out
```

At 00:34:01 this escalated to:

```
amdgpu 0000:03:00.0: [drm] *ERROR* flip_done timed out
amdgpu 0000:03:00.0: [drm] *ERROR* [PLANE:86:plane-8] commit wait timed out
```

followed by:

```
WARNING: CPU: 7 PID: 1473 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:8795
amdgpu_dm_atomic_commit_tail+0x39c4/0x3a90 [amdgpu]
```

The graphical/system state then became unrecoverable and a hard reset was required.

After reboot, the physical display geometry and resolutions were still correct, but the KScreen output priorities had changed.

Before the crash:

```
DP-2: priority 1
DP-3: priority 2
DP-4: priority 3
```

After the hard reset:

```
DP-2: priority 1
DP-3: priority 3
DP-4: priority 2
```

This caused the Plasma desktop/panel/wallpaper assignment normally associated with the middle display to move to the right-hand display. Restoring the original priorities with `kscreen-doctor` corrected this secondary issue.

System details:

```
Debian 13.6
Linux 6.12.101+deb13-amd64
Debian kernel package: 6.12.101-1
firmware-amd-graphics: 20250410-2
AMD Radeon PRO W6600 / Navi 23
PCI ID: 1002:73e3
KDE Plasma Wayland
```

Expected result:

All three displays should continue presenting frames normally. A page flip on one CRTC should not stall an output, prevent subsequent atomic commits, or lead to an unrecoverable graphics state requiring a hard reset.

Full kernel and user-session journals from the failed boot are attached. They contain the original `flip_done` timeout, CRTC and plane commit timeouts, the `amdgpu_dm_atomic_commit_tail` warning, and the corresponding KWin page-flip timeout messages.
---