Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-shell (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1915824
Title:
High CPU load from gnome-shell
Status in gnome-shell package in Ubuntu:
Confirmed
Bug description:
When doing nothing else, there is a constant base-line of CPU usage
from gnome-shell:
```
op - 14:55:09 up 6 days, 1:39, 1 user, load average: 1.36, 1.52, 1.77
Tasks: 400 total, 3 running, 397 sleeping, 0 stopped, 0 zombie
%Cpu(s): 9.5 us, 2.9 sy, 0.0 ni, 85.0 id, 0.1 wa, 0.0 hi, 2.6 si, 0.0
st
MiB Mem : 31848.3 total, 4007.8 free, 12690.2 used, 15150.4 buff/cache
MiB Swap: 980.0 total, 946.3 free, 33.7 used. 18037.0 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
3236 myuser 20 0 5242476 902752 130032 R 41.9 2.8 278:24.48
gnome-shell
```
it is always burning one CPU somewhere between 30-60%
Using strace for the process ID:
```
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
48.14 1.000284 1 697706 645150 stat
11.61 0.241121 3 62789 52442 recvmsg
8.63 0.179359 4 43747 poll
5.67 0.117864 2 44505 getpid
4.94 0.102593 2 44238 getdents64
4.33 0.089898 1 49124 22123 openat
4.16 0.086467 16 5215 ioctl
3.91 0.081323 5 14263 writev
2.11 0.043793 1 27259 close
1.68 0.034954 1 27001 fstat
1.15 0.023988 3 7035 sched_yield
1.10 0.022808 2 9373 read
0.78 0.016186 3 5119 write
0.52 0.010716 3 3541 189 futex
0.44 0.009226 2 4094 mprotect
0.33 0.006878 7 934 clock_nanosleep
0.32 0.006646 3 2018 mmap
0.17 0.003526 1 2040 munmap
0.00 0.000010 0 12 getrusage
0.00 0.000006 6 1 restart_syscall
0.00 0.000004 0 5 recvfrom
0.00 0.000000 0 2 lseek
0.00 0.000000 0 3 timerfd_create
0.00 0.000000 0 3 timerfd_settime
------ ----------- ----------- --------- --------- ----------------
100.00 2.077650 1050027 719904 total
```
What could be causing this?
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.4-1ubuntu1~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-65.73-generic 5.4.78
Uname: Linux 5.4.0-65-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Feb 16 14:50:18 2021
DisplayManager: lightdm
InstallationDate: Installed on 2018-04-27 (1026 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
RelatedPackageVersions: mutter-common 3.36.7+git20201123-0.20.04.1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2021-01-22 (25 days ago)
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