https://bugs.kde.org/show_bug.cgi?id=469273
Bug ID: 469273
Summary: should we not enforce the environment of
QT_AUTO_SCREEN_SCALE_FACTOR under wayland?
Classification: Plasma
Product: plasmashell
Version: 5.27.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: Startup process
Assignee: plasma-b...@kde.org
Reporter: ihi...@gmail.com
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
Created attachment 158625
--> https://bugs.kde.org/attachment.cgi?id=158625&action=edit
virtualbox with QT_AUTO_SCREEN_SCALE_FACTOR=0 looks like this very ugly
When it comes to the X11 we will make sure that:
- [`QT_AUTO_SCREEN_SCALE_FACTOR` is set to
`0`](https://invent.kde.org/plasma/plasma-workspace/-/blob/21cefd1083144e7bc51c6c9b46448a22b0a607f2/startkde/startplasma.cpp#L330)
- [set up a list of `QT_SCREEN_SCALE_FACTORS` to list every screen's scale
factor](https://invent.kde.org/plasma/plasma-workspace/-/blob/21cefd1083144e7bc51c6c9b46448a22b0a607f2/startkde/startplasma-x11.cpp#L52)
When it comes to the Wayland, the `QT_SCREEN_SCALE_FACTORS` is missing,because
we don't need this,as Wayland support mixed DPI ,and there scale factors are
sent properly over wl_output
But,when lack of `QT_SCREEN_SCALE_FACTORS` , some QT application,which only
support `xWayland` need `QT_AUTO_SCREEN_SCALE_FACTOR` to `1` to make
themselves scale properly
For example, under `xWayland`,with two mixed DPI screen :
1. [`virtualbox`](https://software.manjaro.org/package/virtualbox) with
`QT_AUTO_SCREEN_SCALE_FACTOR=0` looks like this very ugly,see attachment No.1
2. [`virtualbox`](https://software.manjaro.org/package/virtualbox) with
`QT_AUTO_SCREEN_SCALE_FACTOR=1` , just looks well as windows/X11
I've tried to set `QT_AUTO_SCREEN_SCALE_FACTOR=1` via `/etc/environment` or
`~/.config/plasma-workspace/env/*.sh` or via `systemd` ,none of these works .
I've dive into the code and find out why:
1. `plasma` has settled the environment here :
https://invent.kde.org/plasma/plasma-workspace/-/blob/21cefd1083144e7bc51c6c9b46448a22b0a607f2/startkde/startplasma.cpp#L330
, and this `setupPlasmaEnvironment` is called after `EnvironmentScripts`
https://invent.kde.org/plasma/plasma-workspace/-/blob/21cefd1083144e7bc51c6c9b46448a22b0a607f2/startkde/startplasma-wayland.cpp#L64-L70
,so environments settled in the `EnvironmentScripts` will be overwrite
1. `plasma` [will export all the settled environment back to
systemd/dbus](https://invent.kde.org/plasma/plasma-workspace/-/blob/21cefd1083144e7bc51c6c9b46448a22b0a607f2/startkde/startplasma-wayland.cpp#L76)
, so environments settled in the systemd/pam mechanise will be overwrite too
basically,I can do noting to change the value of environment variable
`QT_AUTO_SCREEN_SCALE_FACTOR` ,which cause some QT application which only
support `xWayland` scaled at wrong size and looks ugly
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: `Y`
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
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