https://bugzilla.suse.com/show_bug.cgi?id=1222405 Bug ID: 1222405 Summary: KDE lockscreen causes high CPU load Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: KDE Workspace (Plasma) Assignee: opensuse-kde-bugs@opensuse.org Reporter: suse-beta@cboltz.de QA Contact: qa-bugs@suse.de Target Milestone: --- Found By: --- Blocker: --- The KDE lockscreen causes a high CPU load. I noticed this because my laptop fan starts to run when the screen gets locked. top output captured while the screen was locked [1] shows kwin_x11 has 70% CPU usage, and Xorg.bin another 35%. Besides that, there are a few processes using around 5% of the CPU each. Detailed top output: top - 13:17:53 up 1:12, 1 user, load average: 3,19, 2,58, 1,83 Tasks: 355 total, 2 running, 352 sleeping, 0 stopped, 1 zombie %CPU(s): 17,9 us, 14,5 sy, 0,0 ni, 67,6 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st MiB Spch: 15915,35+total, 4685,234 free, 6527,062 used, 6000,609 buff/cache MiB Swap: 0,000 total, 0,000 free, 0,000 used. 9388,289 avail Spch PID USER PR NI VIRT RES SHR S %CPU %MEM ZEIT+ BEFEHL 4344 cb 20 0 1831660 177900 110016 R 70,59 1,092 12:40.65 /usr/bin/kwin_x11 --replace 3370 root 20 0 749548 118196 62984 S 35,29 0,725 8:02.13 /usr/bin/Xorg.bin -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_DDlZwb -noreset -displayfd 16 4341 cb 20 0 579680 84560 72032 S 5,882 0,519 1:21.86 /usr/bin/ksmserver 4474 cb 20 0 195292 24684 22508 S 5,882 0,151 0:10.59 /usr/bin/gmenudbusmenuproxy 4573 cb 20 0 561812 64996 54764 S 5,882 0,399 0:19.37 /usr/bin/kaccess 4575 cb 20 0 1051088 234900 69092 S 5,882 1,441 0:21.40 /usr/libexec/DiscoverNotifier 5005 cb 20 0 655628 81056 68460 S 5,882 0,497 0:10.88 /usr/bin/akonadi_imap_resource --identifier akonadi_imap_resource_4 5007 cb 20 0 729752 82396 69184 S 5,882 0,506 0:12.52 /usr/bin/akonadi_imap_resource --identifier akonadi_imap_resource_6 5016 cb 20 0 1080552 123876 96264 S 5,882 0,760 0:13.42 /usr/bin/akonadi_mailfilter_agent --identifier akonadi_mailfilter_agent 5031 cb 20 0 570772 72236 60936 S 5,882 0,443 0:11.04 /usr/bin/akonadi_pop3_resource --identifier akonadi_pop3_resource_19 5406 cb 20 0 4530272 576832 226140 S 5,882 3,539 8:47.09 /usr/lib64/firefox/firefox 5909 cb 20 0 599256 66552 55972 S 5,882 0,408 0:12.75 /usr/lib/mozilla/kmozillahelper 10991 cb 20 0 2599228 238380 115852 S 5,882 1,463 0:19.97 /usr/lib64/firefox/firefox -contentproc -childID 27 -isForBrowser -prefsLen 51555 -prefMapSize 320619 -jsInitLen 234952 -parentBuildID 20240321230221 -greomni /usr/lib64/firefox/omni.ja -appomni /usr+ 11084 cb 20 0 2665584 286988 119208 S 5,882 1,761 1:47.65 /usr/lib64/firefox/firefox -contentproc -childID 28 -isForBrowser -prefsLen 51555 -prefMapSize 320619 -jsInitLen 234952 -parentBuildID 20240321230221 -greomni /usr/lib64/firefox/omni.ja -appomni /usr+ 13353 cb 20 0 1931812 286692 142972 S 5,882 1,759 0:55.53 /usr/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 37 14009 cb 20 0 10956 6784 5632 R 5,882 0,042 0:00.03 top -n1 1 root 20 0 23368 14948 10696 S 0,000 0,092 0:01.47 /usr/lib/systemd/systemd --switched-root --system --deserialize=41 (all other processes are sleeping at 0% CPU usage) A "boring" lock screen that just displays a background image shouldn't cause such a high CPU load. For comparison: after unlocking the screen, both kwin_x11 and xorg.bin are down to less than 1% CPU usage. I'm not 100% sure when this started, but my best guess is that it was introduced with the update to Plasma 6. [1] in case you wonder - I started the following before locking the screen: while true ; do top -n1 > top-$(date '+%H:%M') ; sleep 60 ; done -- You are receiving this mail because: You are on the CC list for the bug.