[Expired for mutter (Ubuntu) because there has been no activity for 60
days.]
** Changed in: mutter (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1817620
Title:
High cpu usage on alt-tab-ing
Status in gnome-shell package in Ubuntu:
Expired
Status in mutter package in Ubuntu:
Expired
Bug description:
Switching between apps was feeling extremely laggy and unsmooth after
some days of keeping the laptop on and just alt-tab-ing between apps
would keep the cpu consistently at 100% when hitting it more than 8-9
times per second and *not* letting go of Alt (meaning I stay at the
same app).
Some investigation (1) led me to try out restarting the gnome-shell
instance (killall followed by manually starting it in the terminal),
upon which everything seemed zippy again. No lagginess. The restart
was a supposed fix for a memory leak bug (2), but according to the
comments a bug fix was supposed to have landed in 18.04 long ago. So
either this has not been fixed or this bug is about something else -
probably the latter, as the reported memory usage in htop was nowhere
near the gigabytes of memory reported in the bug issue for 16722297.
Another thing worth mentioning perhaps, based on comments in (3) found
through (4), is that I have disabled all extensions. I used to use the
Coverflow extension.
Expected behaviour:
There should be no percieved lag or stuttering in the interface when
switching between applications.
Actual behaviour:
Switching between applications causes a noticable lag/stuttering when the
computer has been running for an extended period of time (weeks, but where it
has mostly been suspended, meaning actual usage is limited to 3-4 days).
1.
https://www.omgubuntu.co.uk/2018/03/gnome-shell-has-a-memory-leak-and-it-might-not-be-fixed-for-ubuntu-18-04-lts
2. https://bugs.launchpad.net/gnome-shell/+bug/1672297
3. https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1773959
4. https://askubuntu.com/a/1090987/165026
System info:
------------
Running Wayland.
Description: Ubuntu 18.04.1 LTS
Release: 18.04
gnome-shell:
Installert: 3.28.3-0ubuntu0.18.04.4
Kandidat: 3.28.3-0ubuntu0.18.04.4
Versjonstabell:
*** 3.28.3-0ubuntu0.18.04.4 500
500 http://no.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
100 /var/lib/dpkg/status
3.28.1-0ubuntu2 500
500 http://no.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
edit: removed info on high cpu usage when using mouse. supposedly
unrelated.
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