Nouveau on Quadro K2200, killed?

Hello folks,

On stable, I see:

```
[Fri Jun 19 07:48:12 2026] nouveau 0000:0c:00.0: fifo: SCHED_ERROR 0a
[CTXSW_TIMEOUT]
[Fri Jun 19 07:48:12 2026] nouveau 0000:0c:00.0:
fifo:000000:0006:[Xorg[2222]] rc scheduled
[Fri Jun 19 07:48:12 2026] nouveau 0000:0c:00.0: fifo:000000: rc scheduled
[Fri Jun 19 07:48:12 2026] nouveau 0000:0c:00.0:
fifo:000000:0006:0006:[Xorg[2222]] errored - disabling channel
[Fri Jun 19 07:48:12 2026] nouveau 0000:0c:00.0: systemd-logind[1146]:
channel 6 killed!
```
...and then the screen restarts and kills all my windows.

This had happened before, but just happend while I was sitting at the
machine just now, so I was able to look.

Any ideas?  firmware-nvidia-graphics and xservers-xorg-video-nouveau
are installed, firmware-nvidia-gps is not (but the k2200 does not have
a GSP).

Cheers!