Thanks for the bug report. In your video I can see two causes that are
not really bugs:
* Firefox using CPU at the same time as gnome-shell means it is Firefox
causing the persistent CPU usage in gnome-shell. Make sure Firefox isn't
displaying animations like web ads. Even if that doesn't look like the
problem, it's still Firefox's fault if the problem is correlated with
that app running.
* Triggering the window spread animation causes even higher gnome-shell
CPU usage. This is normal and not a bug. Although we welcome patches to
make it more efficient.
Suggested workaround: Make Firefox render more efficiently by adding
MOZ_ENABLE_WAYLAND=1 to /etc/environment and then reboot. Also don't
leave any browser tabs open that you don't need.
** Changed in: gnome-shell (Ubuntu)
Status: New => Opinion
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1999578
Title:
Bursts of high CPU usage after triggering overview
Status in GNOME Shell:
Unknown
Status in gnome-shell package in Ubuntu:
Opinion
Bug description:
As requested in the upstream bug report
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6137, I hereby
file the downstream issue:
I am experiencing high cpu usage of gnome-shell in situations where I
would not expect it, leading to my fans running more often and wasting
my battery on my Dell XPS 13 9310 2-in1.
The problem can be seen in action here:
https://www.youtube.com/watch?v=Y9o7a7BGPE4
See also the upstream report for syscap recordings of such situations.
I think there might be a correlation with firefox being opened on
another workspace (but no video or any other playback happening). At
least everytime I notice that my an comes on for no reason and I fire
up top to see gnome shell consuming too much cpu, when I kill all my
firefox windows gnome shell cpu usage goes down as well, but that
could be pure coincidence.
At least I can safely rule out the triple buffering downstream ubuntu
mutter patch, since I recompiled mutter without the patch and it does
not really change the problem much.
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