Bug 328021

Summary:	Screen locker freezes with transparent themes
Product:	[Plasma] kwin	Reporter:	Nikita Zlobin <nick87720z>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	hugo.pereira.da.costa, yyc1992
Priority:	NOR
Version:	4.11.3
Target Milestone:	---
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed In:

Description Nikita Zlobin 2013-11-24 18:17:58 UTC

When screen is locked, screensaved doesn't start, instead - screen becomes black, after what there is no way to get to desktop - only relogin helps. This is already reported on forums, but i did not see any report about it there (mostly was caused by oxygen transparent).

Ttransparency  causes freezing not always - transparent bespin with disabled blur doesn't trigger problem. Qtcurve with 100% opacity doesn't cause problem as well. Disabling of blur kwin effect with transparent qtcurve doesn't help however.

Reproducible: Always

Comment 1 Yichao Yu 2013-11-24 19:38:13 UTC

Don't think this is kwin's problem.
I've noticed this problem in QtCurve recently but don't know what to do about it yet.

Related bug: 
https://bugs.kde.org/show_bug.cgi?id=312425
https://bugs.kde.org/show_bug.cgi?id=311574
https://bugs.kde.org/show_bug.cgi?id=314663 (probably duplicated)

Comment 2 Thomas Lübking 2013-11-24 19:40:44 UTC

"kscreenlocker" &"kscreenlocker_greet" processes are hardcoded to skip ARGB in bespin.

KWin is completely unrelated here - it's between styles and the screensaver (fiddling areound with the window, resp. not catching that)

*** This bug has been marked as a duplicate of bug 314663 ***

Comment 3 Yichao Yu 2013-11-24 19:44:54 UTC

@Nikita Zlobin
(I thought said this somewhere else but cannot find it...) In QtCurve you can also blacklist those processes. I haven't tested myself but it should work.

Comment 4 Yichao Yu 2013-11-24 20:20:35 UTC

@Thomas

Do not set to ARGB when a window already exist and when X11BypassWindowManagerHint is set seems to help.
And we probably don't want translucency on such a window anyway.