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. -- You are receiving this mail because: You are watching all bug changes.