https://bugs.kde.org/show_bug.cgi?id=420754
Bug ID: 420754
Summary: Notifications flicker when fading out
Product: kwin
Version: 5.16.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: b7.10110...@gmail.com
Target Milestone: ---
SUMMARY
When a desktop notification fades out after being shown for several seconds,
the fadeout animation flickers. I've also seen this happen with other kinds of
windows, not only notifications.
A screencast can be seen here: https://youtu.be/l1xR3aAy0Uw . It was taken by
recordmydesktop.
STEPS TO REPRODUCE
1. This bug is hard to catch, but usually it appears after multiple cycles of
suspend/resume. So, try suspending and resuming the system with KWin
compositing turned on.
2. Run
notify-send Test 'Hello world'
3. Wait until the notification displayed begins to fade out
OBSERVED RESULT
The fadeout animation flickers. If compositing is turned off and back on again,
the flicker disappears.
EXPECTED RESULT
The fadeout animation should be smooth, with notification's transparency
changing monotonically in time.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Xubuntu 19.10
KDE Plasma Version: (Plasma shell not running)
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.4
ADDITIONAL INFORMATION
This particular instance was seen on Intel UHD Graphics 620 (Whiskey Lake), but
I've also had this on Kubuntu 18.04.3 with Intel HD Graphics 530 (rev 06), and
on some systems with Nvidia GeForce GTX 750Ti and GTX 460.
This has been happening for many years (since at least 2014) with
ever-upgrading Linux distribution versions on many machines I've been using.
So, although the problem is hard to trigger, it does happen once in a while
(maybe several times a month), and I can do some inspection of internal state
of KWin when I get this flicker again—if you tell me what to look for.
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