https://bugs.kde.org/show_bug.cgi?id=455449
Bug ID: 455449
Summary: Incorrect scaling of login screen with multiple
monitors
Product: kwin
Version: 5.24.4
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: menariaar...@gmail.com
Target Milestone: ---
Created attachment 149835
--> https://bugs.kde.org/attachment.cgi?id=149835&action=edit
Login screen in two different cases are shown.
NOTE
Before I describe the bug in detail, I am aware that there are some scaling
limitations of kwin on X11 for multiple displays. But i feel something can be
done in this particular case so I request you to read all the details
carefully.
SUMMARY
Due to xrandr issues, when multiple displays with different resolutions are
connected the login screen has scaling issues. The larger display accommodates
the login screen properly however the smaller display does not (see the
attachment, top figure). However, i have also noticed that the cursor doesn't
blink on any of the displays in the password text box. But you can still type
in the password without noticing any characters in the text boxes. This means a
user can skip characters and not notice his mistake at all.
Overall, This becomes quite confusing visually as to which display to focus on
to type the password and whether the keyboard is responsive. Thus, a solution
(if possible) is to show the login screen on only one of the connected
displays. GDM3 does the same thing on gnome.
STEPS TO REPRODUCE
1. Connect an external monitor (2560x1440) with a larger resolution than the
laptop (1920x1080)
2. Select X11 session must be default session (Kubuntu 22.04 recommended).
3. Boot the laptop into linux by pressing the turn on button or selecting linux
from the dual boot menu.
4. Login into the user account.
5. Right click and select 'Configure Display Settings'.
6. Select your external monitor as primary display and Disable your Laptop
display (or leave it as secondary display).
7. Save the settings and reboot to the KDE Plasma login screen.
OBSERVED RESULT
Both displays show a login screen scaled to resolution of external display with
(2560x1440) resolution. This results in a cropped screen on the smaller
display.
Cursor in the password text box is missing on both monitors. If you type the
password directly, no activity is visible in the text box.
However, if you click in the password text box first and type the password, it
behaves properly.
EXPECTED RESULT
Login screen should only be displayed on the primary display. Cursor should be
blinking in the text box for typing the password.
On the secondary(or smaller) monitor, a Properly scaled login screen with a
blurred background image and date-time in the center (see external monitor
output in the 2nd frame of the attachment as a reference).
---- OR -----
When an external (or larger resolution) display is connected, only the external
display should show the login screen and laptop screen is disabled. Cursor
should blink in the text box for typing the password.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 22.04
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Kernel Version: 5.15.0-37-generic (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i5-8300H CPU @ 2.30GHz
Memory: 15,5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
ADDITIONAL INFORMATION
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