Problem displaying wallpaper on desktops

[John Collins]

(Apologies if this is a duplication but I posted previously to wrong package)

Hi I'm running Ubuntu 20.4 with the Apr 20 updates applied.

gnome-session:
  Installed: (none)
  Candidate: 3.36.0-2ubuntu1
  Version table:
     3.36.0-2ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu focal/universe i386 Packages
gnome-shell:
  Installed: 3.36.9-0ubuntu0.20.04.2
  Candidate: 3.36.9-0ubuntu0.20.04.2
  Version table:
 *** 3.36.9-0ubuntu0.20.04.2 500
        500 http://gb.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.36.4-1ubuntu1~20.04.2 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     3.36.1-5ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages

I accept that this is "cosmetic" but it's still annoying.

I have two large monitors attached which I run as a large single workspace across both screens.

I have been running this for years without problem over several Ubuntu releases.

Following the recent upgrade (Apr 20 2022), my desktop wallpaper is no longer displayed properly.

Almost all of it is covered in solid black except for a very small sliver of the wallpaper at the bottom of each screen.

If I change the desktop background there is no effect (except for the small sliver at the bottom of the screen) changes.

If I reboot, or if I log in as a different user, there is no change.

If I click "Activities" or press the Windows button, the menu of desktops I can switch to is displayed with the correct wallpaper, but when I switch to it it comes out all black on both screens (apart from the icons, any windows and the sliver at the bottom of the screen).

I have 2 different laptops which I have upgraded also but those are OK. I've not tried any dual-screen on them.

Possibly relevant is that I have an nVidia display controller.

It does appear to be a problem that has crept in with the most recent update.

Everything else I do is unaffected as far as I can see but I'd just like something different from the boring solid black.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1970141, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.