https://bugs.kde.org/show_bug.cgi?id=392288
Bug ID: 392288
Summary: GTK3 does not follow HiDPI scaling by default -- and
quick fix
Product: plasmashell
Version: 5.12.3
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: battagli...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
Created attachment 111623
--> https://bugs.kde.org/attachment.cgi?id=111623&action=edit
Incorrect default scaling behavior for GTK3 apps - ex: manjaro-hello and
Lollypop
In GTK3 apps, the DPI scaling option picked in KDE's system display settings is
dropped erroneously for GTK3. The attached pictures demonstrate the behavior,
as well as the behavior when changing the environment variables.
In the first attached picture, I have KDE's scale variable set at 2.0. You can
see that none of the widgets, window decorations, etc are not scaled and that
everything is tiny.
In the second attached picture, I set the environment variables GDK_SCALE=2 and
GDK_DPI_SCALE=0.5. You can see that the scaling now works properly.
Setting GDK_SCALE=2 scales all of the components, but also double-scales the
fonts, so that they end up being scaled 4x. Setting GDK_DPI_SCALE=0.5 then
"un-scales" the fonts, so that they end up being scaled only 2x.
I'm not sure if this is the best fix, but at least it shows it's possible to
get the right GTK scaling working in Plasma.
I've seen this behavior on both Plasma 5.11 and 5.12.
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