https://bugs.kde.org/show_bug.cgi?id=372046
Bug ID: 372046
Summary: plasma5 show tiny icons in HiDPI screens
Product: plasmashell
Version: 5.8.3
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: gh...@mageia.org
CC: bhus...@gmail.com, plasma-b...@kde.org
Target Milestone: 1.0
Created attachment 102018
--> https://bugs.kde.org/attachment.cgi?id=102018&action=edit
don't force disabling automatic scaling
When plasma5 runs in a HiDPI screen (e.g. a 4k screen with 3820x2160 pixels of
resolution), and the screen DPI is set at the proper values in X11 (e.g. using
DisplaySize in xorg.conf or forcing the -dpi argument in either xrandr or Xorg
executable), the icons aren't scaled proportionally but remains super-tiny, and
thus almost unreadable. The same happens to widgets. The higher is the
resolution, the smaller and unbalanced are the icons. For instance for a 4k
monitor at 15.6" you'll have near to 282 dpi, which is almost 3 times the
typical average DPI choosen at 96x96.
The result is shown in the screenshots here
https://bugs.mageia.org/attachment.cgi?id=8587. As you can see (the image is
scaled for convenience) the icons of the Plasma's "System Settings" are almost
unreadable, while instead the text scales proportionally.
Apparently plasma is able to scale everything proportionally to DPI without the
need of extra tweaking, or playing with env var or xrdb entries, but in this
case it fails. The problems seems in the line:
QT_AUTO_SCREEN_SCALE_FACTOR=0
of the script /usr/bin/startkde, which forces QT_AUTO_SCREEN_SCALE_FACTOR to 0,
and thus "disables the automatic scaling based on the pixel density of the
monitor for QT applications". IMHO this shouldn't be forced in the startup
script, but should be left to system decide whether to apply or not, because if
a user decide to force the QT_AUTO_SCREEN_SCALE_FACTOR=1 somewhere in startup
scripts, those entries will be overridden by the startkde override.
Removing it, would fix the problem, and Plasma will have the right behaviour,
i.e. scale the icons, the widgets and the text, proportionally when requested,
as you can see here: https://bugs.mageia.org/attachment.cgi?id=8586,
I attach the fix.
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