Re: Nouveau on Quadro K2200, killed?

Boyan Penkov composed on 2026-06-19 07:56 (UTC-0400):

> 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).

Try purging xserver-xorg-video-nouveau (upstream name xf86-video-nouveau), which
provides the reverse-engineered, old technology, "experimental", nouveau Xorg
display driver. Removal will allow use of the newer technology default display
driver "modesetting", as shown by inxi below in Trixie and my K2200.

# pinxi -GSaz --za --hostname
System:
  Host: gb970 Kernel: 6.12.85+deb13-amd64 arch: x86_64 bits: 64 compiler: gcc
    v: 14.2.0 clocksource: tsc avail: hpet,acpi_pm
    parameters: root=LABEL=<filter> ipv6.disable=1 net.ifnames=0
    plymouth.enable=0 noresume consoleblank=0 mitigations=off
  Desktop: TDE (Trinity) v: R14.1.6 tk: Qt v: 3.5.0 wm: Twin v: 3.0
    with: kicker vt: 7 dm: 1: TDM 2: XDM Distro: Debian GNU/Linux 13 (trixie)
Graphics:
  Device-1: NVIDIA GM107GL [Quadro K2200] vendor: Hewlett-Packard
    driver: nouveau v: kernel non-free: 550-580.xx+ status: current (as of
    2025-11; EOL~2026-12-xx) arch: Maxwell code: GMxxx process: TSMC 28nm
    built: 2014-2019 pcie: gen: 2 speed: 5 GT/s lanes: 16 ports:
    active: DP-1,DP-2,DVI-I-1 empty: none bus-ID: 01:00.0 chip-ID: 10de:13ba
    class-ID: 0300 temp: 52.0 C
  Display: x11 server: X.Org v: 21.1.16 compositor: Twin v: 3.0 driver: X:
    loaded: modesetting...