gnome-shell consistently using 25% CPU

[Satya]

AM consistently seeing gnome-shell taking 20-30% cpu range. No extensions installed.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-shell 42.9-0ubuntu2.2
ProcVersionSignature: Ubuntu 6.5.0-1023.24-oem 6.5.13
Uname: Linux 6.5.0-1023-oem x86_64
ApportVersion: 2.20.11-0ubuntu82.6
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 5 12:44:10 2024
DisplayManager: gdm3
InstallationDate: Installed on 2024-01-17 (232 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions: mutter-common 42.9-0ubuntu8
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Satya (satya-bangalore)]

now I see it hovering around 8 to 10%. But when zoom application is launched, it is very high.

[Daniel van Vugt (vanvugt)]

Please run:

  cd ~/.local/share/gnome-shell/
  rm -rf extensions

and then log in again. If the problem still occurs then please run:

  journalctl -b0 > journal.txt
  lspci -k > lspci.txt

and attach the resulting text files here.

[Daniel van Vugt (vanvugt)]

Please also run 'top' and tell us which apps are using non-zero CPU.

Or better yet, log in again and without any other apps running, open 'top' in a Terminal. Does the bug still occur?

[Satya (satya-bangalore)]

No extension installed

 cd ~/.local/share/gnome-shell/
satya@satya-ThinkPad-P16v-Gen-1:~/.local/share/gnome-shell$ ls
application_state gnome-overrides-migrated journal.txt lspci.txt notifications
satya@satya-ThinkPad-P16v-Gen-1:~/.local/share/gnome-shell$

[Satya (satya-bangalore)]

I did perf record and report and here is the output I got. I closed everything.

   54.48% 0.00% gnome-shell [unknown] [.] 0000000000000000
+ 24.73% 0.21% gnome-shell [kernel.kallsyms] [k] entry_SYSCALL_64_after_hwframe
+ 24.35% 0.12% gnome-shell [kernel.kallsyms] [k] do_syscall_64
+ 23.20% 0.29% gnome-shell [kernel.kallsyms] [k] x64_sys_call
+ 18.53% 9.64% gnome-shell libgraphene-1.0.so.0.1000.8 [.] graphene_matrix_multiply
+ 17.08% 0.00% gnome-shell [unknown] [k] 0x0000000100000008
+ 16.89% 0.15% gnome-shell libc.so.6 [.] __poll
+ 15.72% 0.11% gnome-shell [kernel.kallsyms] [k] __x64_sys_poll
+ 15.53% 0.14% gnome-shell [kernel.kallsyms] [k] do_sys_poll
+ 12.31% 1.44% gnome-shell [kernel.kallsyms] [k] do_poll.constprop.0
+ 9.71% 0.00% gnome-shell [unknown] [.] 0x0000000200000004
+ 9.65% 0.00% gnome-shell [unknown] [.] 0x0000000200000002
+ 9.39% 0.00% gnome-shell [unknown] [.] 0x0000000200000003
+ 4.69% 1.96% gnome-shell [kernel.kallsyms] [k] timerfd_poll
+ 3.96% 3.21% gnome-shell libglib-2.0.so.0.7200.4 [.] g_main_context_check
+ 3.28% 0.00% gnome-shell [unknown] [.] 0x000055633190de50
+ 3.15% 0.13% gnome-shell libc.so.6 [.] __libc_recvmsg
+ 3.00% 0.00% gnome-shell [unknown] [.] 0x0000000000000001
+ 2.81% 0.54% gnome-shell [kernel.kallsyms] [k] _raw_spin_lock_irqsave
+ 2.75% 0.00% gnome-shell libc.so.6 [.] __libc_sendmsg
+ 2.71% 0.53% gnome-shell [kernel.kallsyms] [k] __raw_spin_lock_irqsave
+ 2.67% 0.98% gnome-shell libgraphene-1.0.so.0.1000.8 [.] graphene_vec4_dot
+ 2.63% 0.02% gnome-shell [kernel.kallsyms] [k] __x64_sys_sendmsg
+ 2.61% 0.10% gnome-shell [kernel.kallsyms] [k] __x64_sys_recvmsg
+ 2.60% 0.06% gnome-shell [kernel.kallsyms] [k] __sys_sendmsg
+ 2.56% 0.01% gnome-shell [kernel.kallsyms] [k] schedule_hrtimeout_range
+ 2.54% 0.11% gnome-shell [kernel.kallsyms] [k] __sys_recvmsg
+ 2.53% 0.05% gnome-shell [kernel.kallsyms] [k] schedule_hrtimeout_range_clock
+ 2.52% 0.90% gnome-shell [kernel.kallsyms] [k] __fget_light
+ 2.52% 0.07% gnome-shell [kernel.kallsyms] [k] ___sys_sendmsg
+ 2.39% 0.40% gnome-shell [kernel.kallsyms] [k] __fdget
+ 2.37% 0.07% gnome-shell [kernel.kallsyms] [k] ____sys_sendmsg
+ 2.34% 0.02% gnome-shell [kernel.kallsyms] [k] schedule
+ 2.30% 0.07% gnome-shell ...