https://bugs.kde.org/show_bug.cgi?id=509388
Bug ID: 509388
Summary: Multiple displays go berserk after changing
configuration and enabling bult-in screen
Classification: Plasma
Product: plasmashell
Version First 6.3.6
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
Created attachment 184893
--> https://bugs.kde.org/attachment.cgi?id=184893&action=edit
photo of the two-display layout
SUMMARY
I have my laptop set up to only use an external monitor (connected via HDMI),
so the built-in screen is disabled and the external one is the primary and only
display. I (almost) always use it this way, it's (almost) always plugged and I
start up my computer this way.
Now I wanted to switch to two screens, so I opened Display Configuration, and I
set the built-in screen to Enabled. It appeared to the left of the external
one, as I wanted.
I didn't notice that the external one was still configured as the primary one -
actually, I didn't notice because there was no indication of it whatsoever: the
"Primary" radio button did not appear! I mistakenly, without thinking, assumed
that the screen on the left was the primary one by definition.
I applied the configuration and what I got was the absolute nonsense that can
be seen in the photos attached.
Both screens have the same resolutions of 1920 by 1080.
I don't even know how to describe in words the mess. Just look at the first
photo. Notice the wallpaper image, especially on the seond (i.e. external)
screen, and notice the task manager especially in the built-in (left) screen.
Also have a look at the second photo.
The fact that the task manager is in the right screen is I guess the expected
consecuence of the fact that the right screen was the primary one, but still,
there's a piece of task manager repeated on the left screen, and a piece of the
left wallpaper repeated in the right screen.... Or it's just a piece of the
right screen that is repeated on the right side of the left screen (which is
confirmed by the second photo with an application open) - but the wallpaper
looks correct on the left screen and not the right one....... again, a complete
mess.
So I opened the Display Configuration settings again (that's when I noticed
that the right screen was selected as the primary one) and I went back to the
external-screen-only configuration. Then I switched back to the two-screen
configuration, and then I was looking for the "Primary" selector and I thought
I was stupid and couldn't find it, but I wasn't there. I had to (not only apply
the configuration but also) close the settings and reopen them in order for the
damn Primary selector to appear.
At this point I noticed that, this second time, the two screens were behaving
fine. There was no repeated piece of screen on both displays or wallpaper
weirdness, all was fine.
So it must be some random, "sometimes" glitch.
STEPS TO REPRODUCE
1. On a laptop, configure the system to use only one external screen, with the
builtin one turned off.
2. boot with that configuration
3. Open Display Configuration; in the dropdown, select the built-in screen and
check the "Enabled" checkbox
=> Note that no "Primary" selector appears
4. Apply
=> Note that STILL no "Primary" selector appears
5. Look at the screens
OBSERVED RESULT
The mess I described
EXPECTED RESULT
The two screens should behave normally, the wallpaper should be repeated on
both, the task manager should be only at the bottom of the screen selected as
Primary (which will be the external one as no opportunity was given so far to
select anything else) and nothing should be duplicated on portions of both
screens.
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 6.3.6
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Kernel Version: 6.6.101-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 12 × 12th Gen Intel® Core™ i7-1255U
Memory: 15.3 GiB of RAM
Graphics Processor: Intel® Iris® Xe Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: Vivobook_ASUSLaptop X1502ZA_F1502ZA
System Version: 1.0
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