https://bugs.kde.org/show_bug.cgi?id=467507
Bug ID: 467507
Summary: plasma-mobile fails to start on PP after kwin's commit
eef9bd5c with "libkwinglutils: Shaders are not
supported"
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: marco.matti...@hotmail.it
Target Milestone: ---
Created attachment 157373
--> https://bugs.kde.org/attachment.cgi?id=157373&action=edit
photo of PP when plasma-mobile does not start on kwin 5.27.2
SUMMARY
Hi and thank you for developing kwin!
On my OG PP with Mobian bookworm, plasma-mobile 5.27.2 is no more working since
kwin 5.27.2 hit the testing repo. Please note, plasma-mobile 5.27.2 was working
correctly on top of kwin 5.26.90 and downgrading kwin back to 5.26.90 reverts
back to a working state. Additionally, another Mobian user reported this on
Matrix on their Pinetab.
After logging in, a white rectangle in the top right corner appears on top of
black background. Nothing else happens, GUI never appears.
By comparing the journalctl log with a previous one, the following line seems
new
mar 12 21:10:59 mobian kwin_wayland_wrapper[977]: libkwinglutils: Shaders are
not supported
Furthermore, by git bisecting kwin, problems starts happening after commit
eef9bd5c [1].
Looks to me, that commit is identifying if some low-spec devices are present,
thus setting some flags to disable features which run smoothly on higher-spec
systems only. Driver for OG PP video rendering (Lima) is also mentioned in that
commit.
Just guessing, that commit is setting device as unable to do a bunch of things
(including shaders, as of error message), but it's failing to keep some other
part of kwin from triggering those things?
Is there a way to tell plasma-mobile to not use shaders, like [2] for blur?
That could be a temporary workaround
[1]
https://invent.kde.org/plasma/kwin/-/commit/eef9bd5c4e564e9cbca6188c52cb3cee5ab9c825
[2]
https://invent.kde.org/plasma-mobile/plasma-phone-settings/-/blob/master/etc/xdg/kwinrc#L6
SOFTWARE/OS VERSIONS
Linux: 6.1-sunxi64
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
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