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!
--
Boyan Penkov

--- PyGate Linux v1.5.17
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

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...
--
Evolution as taught in public schools is, like religion,
based on faith, not based on science.

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

--- PyGate Linux v1.5.17
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Fri, Jun 19, 2026 at 10:00?AM Felix Miata <mrmazda@earthlink.net

wrote:

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 schedu

led

[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 di

splay

driver "modesetting", as shown by inxi below in Trixie and my K2200.

Super -- thanks kindly for the suggestion! It was indeed installed automatically, as a dependecy of xserver-xorg-video-all, which we
might want to re-evaluate.

# 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 (tri

xie)

Graphics:
Device-1: NVIDIA GM107GL [Quadro K2200] vendor: Hewlett-Packard
driver: nouveau v: kernel non-free: 550-580.xx+ status: current (as o

f

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:1

3ba

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...

Interestingly, even before above, I was in modesetting, so I'm not
sure here, but will keep an eye out...

```
Display: x11 server: X.Org v: 21.1.16 with: Xwayland v: 24.1.6
compositor: gnome-shell driver: X: loaded: modesetting unloaded: fbdev, vesa
dri: nouveau gpu: nouveau display-ID: :0 screens: 1
```

Cheers!

--
Evolution as taught in public schools is, like religion,
based on faith, not based on science.

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

--
Boyan Penkov

--- PyGate Linux v1.5.17
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

Boyan Penkov composed on 2026-06-20 14:38 (UTC-0400):

On Fri, Jun 19, 2026 at 10:00?AM Felix Miata wrote:

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.

Super -- thanks kindly for the suggestion! It was indeed installed automatically, as a dependecy of xserver-xorg-video-all, which we
might want to re-evaluate.

xserver-xorg-video-all installs all GPU-specific drivers by default because the modesetting driver doesn't support various antiques that the OS still supports. Still, such antiques are so very old now that the time for dropping their support
from /standard/ installations xserver-xorg-video-all may have come.

Display: x11 server: X.Org v: 21.1.16 compositor: Twin v: 3.0 driver: X: >> loaded: modesetting...

Interestingly, even before above, I was in modesetting, so I'm not
sure here, but will keep an eye out...

There may be some installation algorithm that notes GPU and then includes something buried in either the /usr/ tree or /etc/X11/xorg.conf.d/ that precludes
use of the old driver in favor of modesetting. When modesetting works for the GPU
present, there's no compelling need for any of the drivers xserver-xorg-video-all
installs. xserver-xorg-video-vesa and xserver-xorg-video-fbdev may be worth having, but only as fallbacks in case something has broken modesetting and a crude
fallback is acceptable or required for making repairs.
--
Evolution as taught in public schools is, like religion,
based on faith, not based on science.

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

--- PyGate Linux v1.5.17
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

Sven Joachim composed on 2026-06-20 21:33 (UTC+0200):

On 2026-06-20 15:15 -0400, Felix Miata wrote:

Boyan Penkov composed on 2026-06-20 14:38 (UTC-0400):

Interestingly, even before above, I was in modesetting, so I'm not
sure here, but will keep an eye out...

There may be some installation algorithm that notes GPU and then includes
something buried in either the /usr/ tree or /etc/X11/xorg.conf.d/ that precludes
use of the old driver in favor of modesetting.

No, the X server prefers modesetting over nouveau on any halfway recent
(less than 20 years old) card. This is due to a patch[1] which Debian
has copied from Fedora.

So, something buried somewhere in /usr/. :D

1. https://sources.debian.org/src/xorg-server/2%3A21.1.23-1/debian/patches/07_use-modesetting-driver-by-default-on-GeForce.diff--

Evolution as taught in public schools is, like religion,
based on faith, not based on science.

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

--- PyGate Linux v1.5.17
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)