[Bug 1930945] Re: ubuntu desktop - changing display configuration lost wallpaper (trap messages filled dmesg)

[Chris Guiver]

I'm unable to change wallpaper now.

On selecting some they appear to flash on screen, then get replaced by a
image... currently this firefox window appears on my other display with
this "add comment" box frozen at the word "currently" last line when the
image was changed...

Wallpaper on other image just re-freshed, now contains all of last
paragraph... setting is on the 'clock' or change image..

No squashfs errors appear in `dmesg`.

As stated earlier.. operation of box appears unimpacted, however the
'firefox' image replacing the originally-blue background is a
concentration-problem for me..

The other screen now appears to be updating regularly as I type, rather
than time interval.. behavior appears somewhat inconsistent with
background (no longer static).

Likely nouveau/nvidia issue; sorry I was unsure thus the incorrect
`ubuntu-desktop`.

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https://bugs.launchpad.net/bugs/1930945

Title:
  ubuntu desktop - changing display configuration lost wallpaper (trap
  messages filled dmesg)

Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  Ubuntu Desktop Impish daily test.

  Changing display positions in settings.  I have two monitors, one
  above the other (so not the default).

  I made change and it look okay so I said keep. I noticed I was wrong
  having TOP/BOTTOM displays the wrong way, detected via mouse movements
  between displays so I made another change of the TOP/BOTTOM displays
  in "DISPLAYS" of GNOME settings...

  ** Expected Results

  On changing display orientation I expect wallpaper to be redrawn, or
  remain on screen

  ** Actual Results

  I now have BLUE background on both displays.

  /var/crash is empty... operation appears normal; I lost background.
  lots of TRAP messages though fill `dmesg`

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: ubuntu-desktop 1.469
  ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
  Uname: Linux 5.11.0-16-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu67
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.461
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jun  5 03:01:52 2021
  LiveMediaBuild: Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210604)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-meta
  UpgradeStatus: No upgrade log present (probably fresh install)

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