Bug 443274 - Wallpaper on secondary monitor is replaced with black background after reboot
Summary: Wallpaper on secondary monitor is replaced with black background after reboot
Status: RESOLVED DUPLICATE of bug 353975
Alias: None
Product: plasmashell
Classification: Plasma
Component: generic-multiscreen (show other bugs)
Version: 5.22.4
Platform: openSUSE Linux
: NOR normal
Target Milestone: 1.0
Assignee: Aleix Pol
Depends on:
Reported: 2021-10-04 02:15 UTC by JohnRCox@comcast.net
Modified: 2022-01-24 19:38 UTC (History)
2 users (show)

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Description JohnRCox@comcast.net 2021-10-04 02:15:09 UTC
The wallpaper on a secondary monitor will disappear on reboot/power off, leaving a black background. It can be restored in "System Settings" by temporarily making the secondary monitor the primary.

1. Have a system with multiple monitors.
2. Have a wallpaper in the background on each monitor
3. Restart system several times, perhaps powering off.

The monitor that is the secondary monitor will have a black background. The wallpaper can be restored by making the secondary monitor the primary, pressing "Apply." 

Both monitors should retain their backgrounds to the previously set values on restart/power off.

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

Comment 1 Nate Graham 2021-10-04 23:50:42 UTC
What kind of GPU are you using?
Comment 2 JohnRCox@comcast.net 2021-10-04 23:59:53 UTC
It's an Nvidia GTX 1050 Ti.

I would be surprised if it's a hardware problem. Seems to me like a problem with the "restore the wallpaper on the secondary monitor(s) code."
Comment 3 Nate Graham 2021-10-05 14:10:39 UTC
In this case I think it's actually not a hardware issue. :) Some AMD GPUs trigger a kernel bug that causes issues like this, but NVIDIA GPUs don't have the same problem. It is more likely to be a software issue on our side.

If you right-click on the black background, do you see a context menu? Can you move desktop icons there? Was there a panel there too that inappropriately moved elsewhere
Comment 4 JohnRCox@comcast.net 2021-10-05 21:47:39 UTC
Right clicking does NOT bring up a context menu.

I can move icons over to the black background, but they aren't visible there. Interestingly, I don't think there were any icons on either screen initially, but they appeared later, when I right clicked on the wallpaper.

I don't believe there were ever any panels on that monitor.
Comment 5 Nate Graham 2021-10-06 14:59:08 UTC
Ah oh, so it's not just that the wallpaper went missing--the whole containment is missing.

Can you check in the Display Configuration KCM whether or not one of your screens is slightly overlapping the other one--even by just one pixel? If so, this is Bug 391531.
Comment 6 JohnRCox@comcast.net 2021-10-07 01:31:10 UTC
I have used KDE for a long time but I'm not too familiar with the internals.

I used the Nvidia X Server settings to identify positions. The monitors are 1680 x 1050. The secondary monitor is at 0,0. The primary is at 1680, 0. That doesn't seem to be an overlap. I don't know how to get into the KCM settings you asked for. I hope this answers your question.
Comment 7 Nate Graham 2021-10-07 15:39:48 UTC
Thanks for the info. If there's no overlay, then this is in fact Bug 371717.

*** This bug has been marked as a duplicate of bug 371717 ***
Comment 8 Nate Graham 2021-10-07 15:39:56 UTC
Comment 9 Nate Graham 2022-01-24 19:34:45 UTC

*** This bug has been marked as a duplicate of bug 442826 ***
Comment 10 Nate Graham 2022-01-24 19:38:47 UTC

*** This bug has been marked as a duplicate of bug 353975 ***