xubuntu : displays have become blank & unusable

[ 341.008336] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[ 434.346319] perf: interrupt took too long (2523 > 2500), lowering kernel.perf_event_max_sample_rate to 79250
[ 440.365961] nouveau 0000:01:00.0: fifo: CACHE_ERROR - ch 4 [Xorg[1630]] subc 3 mthd 0208 data 000000cf
[ 440.380700] nouveau 0000:01:00.0: gr: TRAP_MP_EXEC - TP 0 MP 0: 00000010 [INVALID_OPCODE] at 07fac4 warp 19, opcode bffffdde bf7fffff
[ 440.380713] nouveau 0000:01:00.0: gr: TRAP_MP_EXEC - TP 0 MP 1: 00000010 [INVALID_OPCODE] at 07fac4 warp 1, opcode bffffdde bf7fffff
[ 440.380719] nouveau 0000:01:00.0: gr: 00200000 [] ch 4 [000f739000 Xorg[1630]] subc 3 class 8297 mthd 1b0c data 1000f010
[ 1836.468475] perf: interrupt took too long (3154 > 3153), lowering kernel.perf_event_max_sample_rate to 63250

I think first message here is when I mounted the external drive (in thunar) and started opening selected/random files in default apps; first was picture files (jpg, png..), pdf then I selected a video file which is where it went wrong

the nouveau lines are where I believe it went wrong

If I move the cursor to where I believe I placed the panel (in my QA-tests I move things around in what I consider is normal user play/configs), i do get different reaction to left-mouse clicks. I believe the session is operating normally, with just display mucked up. I suspect the left-click causes the menu to appear, which is just shown as different hyro-glyphics to when I left-click on other areas of the screen.

I can't get sound from parole, but it's been closed (I would have pressed ALT+F4 etc to attempt to re-gain control over session) so I can't even use sound to confirm session is running correctly (just display isn't).

Not all behavior is predictable, but I had multiple windows open & given I cannot see the actual display, it's very likely this is the reason (on occasions the background for both displays becomes white instead of black, but that could be I've just highlighted a unseen window for example). All this is guess as the displays are unusable.

/var/crash is empty !

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1886129

This certainly sounds like it's related to the nouveau driver. Are you still able to reproduce this behavior in 22.04?

I agree it sounds like nouveau. That box has issues with the 5.13/5.15 kernel with GNOME, KDE with nouveau on occasion, and has for a few releases now (22.04, 21.10 & possible earlier).. but was always good with Lubuntu/Xubuntu (I really use it now only for install tests & have been thinking of switching out video card)

I booted Xubuntu 22.04 LTS on the box the bug report was made on
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

the external drive is no longer present, so I instead `apt install nfs-common` & mounted a NFS share for the random video files. Display setup was adjusted to match my setup (one screen above the other), then thunar navigated to various directories containing video files, and them dragged to an open parole player.

The parole player was adjusted (window size), dragged around, maximized, un-maximized, full-screen, normal, then another video file dragged to it. This was repeated many times with many different files (may not have been the same file type).

I did NOT re-create that issue.

ALTERNATE/DIFFERENT ISSUE:

I did have a case where a new video was started (mp4) in the existing player, the player was dragged to the other screen, then made to be full-screen; the controls went to the bottom of the screen, but the movie-picture did not increase in size; remaining the same identical size/shape as before the 'f' for full-screen was commanded (ie. picture remained small window size).

If I hit 'f' again to return it to normal size; it would return to normal, hit 'f' again and it properly went to full size (controls at bottom of screen and video-picture using all of screen size)... hitting 'f' repeatedly to return to window, then back to full-screen (not pressing 'f' quickly; giving it time to cope given this box is old/slow) & the issue of black-background, controls at the bottom but video-picture remaining window-size would re-occur every so often (3rd time, 5th time, 11th time, 12th time, .. On some occasions the small video-picture had the rest of the display black, other times the wallpaper & thunar window was still evident.

That however is a different issue.. and again maybe nouveau related so I'm going to ignore unless requested to file a new bug against it (where I'll try & re-create it & explore further, inc. on another box [hp 8200])

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