Bug 457060

Summary: [Wayland] Cannot adjust second monitor resolution if application is fullscreen
Product: [Plasma] KScreen Reporter: David Korth <gerbilsoft>
Component: commonAssignee: kscreen-bugs-null <kscreen-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: nate, xaver.hugl
Priority: NOR    
Version: 5.25.3   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description David Korth 2022-07-24 04:25:35 UTC 
Assume the following display setup:
1. Laptop with 1366x768 LCD
2. TV connected using HDMI at 1280x720
3. mpv running full-screen on the TV

Attempting to set the TV resolution to 1920x1080 results in nothing happening, though Display Configuration appears to have been successful. Un-fullscreening mpv and trying this again works without any issues.

STEPS TO REPRODUCE
1. Run mpv fullscreen on the second monitor.
2. Use Display Configuration to change the second monitor's display resolution.

OBSERVED RESULT
Nothing happens, though Display Configuration acts like it was successful.

EXPECTED RESULT
Second monitor should change resolution.

SOFTWARE/OS VERSIONS
Linux: Kernel 5.18.10
KDE Plasma Version: 5.25.3
KDE Frameworks Version: 5.96.0
Qt Version: 5.15.5

Not sure if this is Wayland-specific or if it happens on X11 as well.
Comment 1 David Korth 2022-07-24 04:27:35 UTC 
Additional data point: If I switch to a different virtual desktop (assuming mpv isn't set to "all desktops") and then try to change the second monitor's resolution, it *does* work.
Comment 2 Zamundaaa 2022-08-04 16:46:13 UTC 
Works fine here. If you put
KWIN_DRM_NO_DIRECT_SCANOUT=1
into /etc/environment, does that make it work for you as well?
Comment 3 Nate Graham 2022-11-08 23:15:00 UTC 
.
Comment 4 Bug Janitor Service 2022-11-23 05:16:08 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 5 Bug Janitor Service 2022-12-08 05:15:39 UTC 
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!