https://bugs.kde.org/show_bug.cgi?id=445680
Bug ID: 445680
Summary: Wayland - HiDPI screen scaling broken after login to
the desktop
Product: KScreen
Version: 5.23.3
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: sla...@kaplonski.pl
Target Milestone: ---
SUMMARY
I'm using Plasma on Arch Linux Lince some time and I'm pretty happy with it.
Recently I moved from FullHD external monitor to 27 inch 4K. Monitor is
connected to the TB dock (Lenovo Thunderbolt 3 Dock Gen 2) using DP port.
Because scaling on such screens is much better on Wayland IMO, I moved to the
Wayland now. And here is the problem which I have:
I configured it like: "resolution 3840x2160", "Scale 150%" - that works very
good for me. But after I e.g restart my laptop and login into plasma desktop,
it has just FullHD resolution on the screen. But the problem isn't the wrong
resolution configure really (that I could easily change in settings :). The
main issue is that in plasma settings it's still "resolution 3840x2160", "Scale
150%" thus on the screen I really see just 1/4 of the desktop (bottom left
corner). To fix it I need to run krunner and with that turn on systemsettings.
Then go to the display settings, change resolution of the screen to some other
than 3840x2160, apply and confirm new settings and then configure again correct
resolution to have everything working fine :)
There is also problem that when there is that wrong resolution configured,
mouse coursor is also working in weird way. It isn't really in the place where
it should be so to fix resolution settings first I need to do all of that
"blindly" :)
STEPS TO REPRODUCE
1. Set 4K display resolution to 3840x2160 and scalling to 1.5
2. Reboot OS or log out and then log in back to the desktop
OBSERVED RESULT
Only huge lower left corner is shown. Resolutions in Settings is OK and also
the mouse did not click in the right place on the high-DPI screen.
EXPECTED RESULT
Desktop should be displayed properly
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2
Kernel Version: 5.15.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz
Memory: 62,5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
ADDITIONAL INFORMATION
On reddit someone pointed me to the bug
https://bugs.kde.org/show_bug.cgi?id=445253. It does sounds a bit similar in
terms that You cannot really set proper resolution and scalling just like that
as it looks that it's already set properly. To fix the issue You have to change
resolution to some different value, apply new settings and then set it again to
the wanted one.
But as other symptompts (huge left corner of the desktop displayed only, mouse
not working properly) I'm opening new bug for that.
If You think it's the same issue, please mark this as duplicate of the
https://bugs.kde.org/show_bug.cgi?id=445253 :)
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