https://bugs.kde.org/show_bug.cgi?id=381280
Bug ID: 381280
Summary: Increased CPU usage with Qt 5.9
Product: plasmashell
Version: master
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: j...@kde.org
CC: bhus...@gmail.com, mgraess...@kde.org,
plasma-b...@kde.org
Target Milestone: 1.0
I'm seeing increased CPU usage from both kwin_x11 and plasmashell after I
updated "everything" after several months of no updates. Now both kwin_x11 and
plasmashell consume >20% of CPU time according to htop, and the cooling fan
spin on an idle system.
I'm on Gentoo Linux with kernel 4.9.31, xorg-server-1.19.3, xorg-x11-7.4-r2,
mesa 17.1.1, Qt 5.9 from git (last week's), kf5 and plasma-* from git master as
of last week. I'm using KMS with an integrated Intel Skylake GPU (i5-6300U,
Thinkpad T460s).
Initially everything works well. After I dock the machine and kscreen switches
to an external screen (which happens to be bigger in resolution), both
plasmashell and kwin_x11 put increased load on the CPUs. Stuff gets fixed when
I log out and log back in while docked. When I un-dock and re-dock after that
(and the screen switches), the increased CPU load is back there.
I tried looking into `perf top` for both kwin_x11 and plasmashell, but I don't
see anything that is suspicious to my untrained eyes.
I've heard some rumors on IRC about Qt sending expose events that it should not
be sending. I have no clue whether the bug is in Plasma, Qt, Mesa or somewehere
else. I know that it is not in the kernel because I see the same behavior on
4.9.18 that I used to run before. However, because I'm seeing this high load in
plasma apps, I'm reporting the bug here.
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