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[roots <1753057@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hi,

I'm running Ubuntu 18.04 Bionic daily with proposed updates enabled. I
am using gnome-flashback (gnome-panel) with Compiz and am getting high
CPU loads attributed to Compiz. That is, Compiz is permanently hovering
at around 10..50% and peaking at 800%. Considering my H/W specs below,
this appears a bit "unusual". CPU usage is peaking when resizing desktop
windows and scrolling pages in Firefox.

Important hint: When I check GPU usage with intel-gpu-tools, the GPU
seems to be idling, with GPU frequency at minimum and GPU usage staying
at 0% even when doing wild window resizes. On my Ubuntu 16.04 (see
below), this will get me up to 20..30% GPU usage.

H/W:

CPU: Core i7-7700k @ 5GHz
GPU: Using Intel IGP (HD630)
RAM: 16GB DDR4
SSD: Intel Optane

S/W:

$ cat /proc/version
Linux version 4.15.0-11-generic (buildd@lgw01-amd64-016) (gcc version 7.3.0 (Ubuntu 7.3.0-5ubuntu1)) #12-Ubuntu SMP Fri Feb 23 18:39:58 UTC 2018

$ lspci -nnk | grep -iA2 vga 
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 630 [8086:5912] (rev 04)
	Subsystem: Gigabyte Technology Co., Ltd HD Graphics 630 [1458:d000]
	Kernel driver in use: i915

$ modinfo i915
srcversion:     4963AD5BD78D754BBD09EAF
name:           i915
vermagic:       4.15.0-11-generic SMP mod_unload 
signat:         PKCS#7

$ dpkg -l | grep compiz
ii  compiz                                     1:0.9.13.1+18.04.20180302-0ubuntu1
$ dpkg -l | grep xserver-xorg-video-intel 
ii  xserver-xorg-video-intel                   2:2.99.917+git20171229-1                   amd64
$ dpkg -l | grep xorg
ii  xorg                                       1:7.7+19ubuntu5                           amd64
$dpkg -l | grep mesa
ii  libegl1-mesa:amd64                         18.0.0~rc4-1ubuntu3

I also tried todays latest GFX drivers from the oibaf ppa, but that did not make any difference.
On another Ubuntu 16.04 install, I'm running compiz 1:0.9.12.3+16.04.20171116-0ubuntu1 without any issues.


Cheers,
r.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1753057

Title:
  Compiz causing high CPU load in Ubuntu 18.04 Bionic

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