https://bugs.kde.org/show_bug.cgi?id=488476
Bug ID: 488476
Summary: Lingering scene/workspacescene issue resulting in
system freeze?
Classification: Plasma
Product: kwin
Version: 6.0.5
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: wannabethe...@gmail.com
Target Milestone: ---
Created attachment 170488
--> https://bugs.kde.org/attachment.cgi?id=170488&action=edit
mangohud showing FPS 0/frametime inf on focus switch
SUMMARY
When a borderless windowed/fullscreen game (noticed with Proton, but a native
Unity game shows the symptom) switches focus, kwin apparently has a chance to
hard freeze the system when the window switches focus. Wayland session.
Mangohud might matter? Not sure as the freeze is too inconsistent.
STEPS TO REPRODUCE
1. Run game in borderless windowed/fullscreen.
2. Press meta key to open and close application launcher or alt+tab out and
back repeatedly.
OBSERVED RESULT
If mangohud is enabled, FPS drops to 0 with inf frametime for a second as the
window switches focus. An example is attached. The system may freeze during
this.
EXPECTED RESULT
The system doesn't freeze, and mangohud doesn't do that.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: CachyOS
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
ADDITIONAL INFORMATION
When kwin 6.0.4 released, this bug was introduced:
https://bugs.kde.org/show_bug.cgi?id=485730
On that release borderless windowed/fullscreen games had a constant stutter and
mangohud was flickering badly. Then would eventually have a system freeze.
That was fixed in 6.0.4.1 with:
https://invent.kde.org/plasma/kwin/-/merge_requests/5626
But that still left that hiccup visible with mangohud, which didn't exist on
kwin 6.0.3.1. From kwin 6.0.4.1 to 6.0.5 I didn't have any system freezes when
alt tabbing from borderless windowed/fullscreen games until today.
After it happened through normal use, I tried to cause it on purpose by
spamming the application menu with the meta key and the system froze after
about 10 seconds. However one more try after that didn't freeze after about a
minute. Mangohud on all three times.
Like with the system freezes I had on kwin 6.0.4, the journal stops writing
once it happens and I can't switch TTY.
Also, mangohud doesn't drop when the window switches focus on an X11 session.
If kwin is downgraded to 6.0.3.1, mangohud still doesn't drop when the window
switches focus on Wayland.
--
You are receiving this mail because:
You are watching all bug changes.
