desktop-packages team mailing list archive

[V <vincentlu24@xxxxxxxxx>]

Same here, on a desktop with 14.04 64 bit with default DE (Unity), using
a  gtx 260 with the recommended proprietary and tested driver, with all
updates, using 2 external monitors.

I've tried turning off features/special effects in compiz to see if
there was any change but the problem still persisted. It helped a bit
but compiz was still eating abnormal amounts of cpu.

I've found 3 solutions thus far that solved problem but I'm not sure if
it'll work for anyone else:

1. Switching to the open source driver (in my case, the nouveau driver because I'm using an nvidia card)
2. Switching the DE to something that isn't unity
3. Disabling my 2nd monitor

Obviously, the first option was ideal as everything just worked and I
didn't have to sacrifice a monitor or switch DE's.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/1293384

Title:
  Compiz CPU usage dramatically increased in Ubuntu 14.04

Status in Compiz:
  Triaged
Status in “compiz” package in Ubuntu:
  Triaged

Bug description:
  It appears that the workload of low-level graphical operations used by
  compiz when, for example, moving windows has increased dramatically
  between Ubuntu 12.04 and Ubuntu 14.04.

  This might not be that visible when using high-end gpus, but should be
  clearly visible when using compiz on llvmpipe and to some-extent
  invalidates the approach of using compiz on top of llvmpipe as a
  fallback when no GPU is available:

  How to reproduce:
  1) Use the unity-3d desktop in Ubuntu 14.04 on top of a non-accelerating Xorg driver like "modesetting". Move windows around. Note peak and average cpu-usage.

  How to verify compiz is the culprit:
  1) copy /usr/bin/compiz from a Ubuntu 12.04 installation. Drop it in as /usr/bin/compiz on 14.04. Reboot. Perform the same window movement. CPU-usage should be substantially lower.

  This problem also affects VMs running on VMware ESX with a software-
  rendering GPU. Window movement becomes sluggish, which suggests that
  even with GPUs, compiz has increased the number of operations required
  to move windows.

To manage notifications about this bug go to:
https://bugs.launchpad.net/compiz/+bug/1293384/+subscriptions