High cpu Xorg kwin_X11 after 16.10 upgrade

[Richard]

After an upgrade to 16.10 on a 2-core 4-thread 2015 cpu system
i915 i5-5287U KDE X

Xorg has 11.9% cpu at idle, 4x that of Ubuntu 16.04
kwin_X11 has cpu about 10%, too

This causes the fan to run at 4600 RPM which is very noisy as opposed to 3200 RPM which is inaudible
temp is 79.0°C which is about 12 C higher

There does not seem to be a gtk app exhibiting high cpu, they are all still below 4%

Basically Chromium Konsole LibreOffice

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: kwin-x11 4:5.7.5-0ubuntu2
ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
Uname: Linux 4.8.0-27-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Nov 17 08:34:09 2016
SourcePackage: kwin
UpgradeStatus: Upgraded to yakkety on 2016-11-16 (0 days ago)

[Richard (ismail-a)]

The high cpu usage is caused by having GNOME System Monitor open

Without that app, Xorg is 2.0% and kwin_x11 2.3%
cpu is 95% idle as expected

[Richard (ismail-a)]

The GNOME System Monitor resources tab, of course

[Flames_in_Paradise (ellisistfroh-deactivatedaccount)]

The KDE-equivalent would be ksysguard [1] which can be installed via packagemanager, anyway it should be there already within a standard-installation.

Any reason why not using that within a KDE-environemt?

Hence this occures with a GNOME-APP, please report it against that then.

[1] http://packages.ubuntu.com/yakkety/ksysguard

[Richard (ismail-a)]

ksysguard takes itself 2.6% with no increase from Xorg and kwin_x11

My point is that for 16.04, GNOME System Monitor worked just fine
with 16.10, straight upgrade, it eats 10% of idle cpu time on 2 core hyper-threading

Something changed between Plasma 5.5.5 and 5.7.5, X, i915

[Richard (ismail-a)]

And I used to use GNOME, but gdm3 3.16+ is a disaster and the rest of GNOME can’t be made stable on a multiple-display laptop. Hence kde/lightdm.

[Richard (ismail-a)]

I’m at 2900 rpm now, which is better than the rpm on 16.04 and only audible 5" away

[Flames_in_Paradise (ellisistfroh-deactivatedaccount)]

Marking this bug-report as "Opinion" to close it's records.

Under the assumption that issue is solved with the coressponding KDE-Application.

In KDE you can always switch-off hardware-graphics-acceleration (effects) temporarely by pressing:

ALT+shift+F12

This will of course also extend battery-life, if you are w/o powerline.

Please feel free to reopen the bug-report, in case the report was closed in error.