https://bugs.kde.org/show_bug.cgi?id=512402
Bug ID: 512402
Summary: External display exhibits weird behaviour when
connected with a laptop trough HDMI
Classification: Plasma
Product: kwin
Version First 6.5.80
Reported In:
Platform: KDE Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
When booting up, either with the lid open or closed, plasma doesn't remember
the previous settings of the external display. It always defaults to 1680x1050
with 100% scaling and 59.88Hz. Even if I change the resolution back to
1920x1080 the screen doesn't reflect the change, everything still looks blurry.
Another peculiar behaviour that happens is that when I boot up with the lid
open, the system takes longer to load for some reason. With the lid is closed
while booting up, it loads much faster.
Another weird behaviour is that, sometimes, when I resume from sleep, the Panel
simply disappears. When that happens I have to go to settings and change the
resolution or scaling and then the Panel appears again.
Yet another weird behaviour is that, when I open the lid while the laptop is
running the external screen defaults to 1680x1050 with a weird scaling 0.6667%
(see attachments). Then when I close the lid it defaults back to 1920x1080 but
with a scaling of 0.6667%.
This was tested when I mirror both screens.
STEPS TO REPRODUCE
1. Boot the laptop with the HDMI cable plugged in (either with the lid closed
or open);
2. Closing or opening the lid;
3. Resuming from sleep
OBSERVED RESULT
Plasma doesn't remember the external screen settings and sets the resolution to
1680x1050 with a scaling of 0.6667%. The same behaviour is also true when
resuming from sleep.
EXPECTED RESULT
The resolution and scaling should remain the same when booting up the laptop
with the lid either closed or open. When closing or opening the lid while the
system is running. When resuming from sleep.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Linux
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.0
Kernel: 6.17.8-arch1-1 (64-bits)
Wayland
ADDITIONAL INFORMATION
This is not a KDE Linux problem, it happens with other distributions as well
(Fedora 43 or Kubuntu). It's a long running issue that happened with other
plasma or framework versions, and other kernel versions.
The laptop in question is an MSI Summit E16 (A12UCT model) with a dedicated
HDMI port. It has a i7 1280p CPU with two GPUs Iris Xe + Nvidia rtx 3050.
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