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[Von <1424013@xxxxxxxxxxxxxxxxxx>]

Ok, this bug is back again.

Here is what occured.

After unchecking the X11 sync a few weeks ago, I noticed that all of my
window menus were missing.

While poking around in CCSM to remedy this problem I accidentally
clicked on "restore defaults." This caused unity to be disabled somehow.

After restoring unity and compiz settings, I tried to log in but got
artifacts and the 100% cpu with compiz problem.

I just need the computer to work, but it is failing.  I cannot use
Nouveau because I get the "GPU lockup" issue.

Townsend, I installed your ppa and it didn't fix it, there was no
change.

I've removed (and purged) all nvidia drivers, unity, ubuntu-desktop,
lightdm and reinstalled them.  I've deleted my xorg.conf and let a new
one be made.

I'm at a loss with nothing else to do, any suggestions are welcome.

Thanks,
I unchecked X11 sync again, but there is no change. Unity bar is artifacted and compiz is using large amounts of CPU.

I double checked glxinfo output in case something got messed up there,
but it remains the same as before.

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https://bugs.launchpad.net/bugs/1424013

Title:
  Compiz high CPU and UI freeze on NVIDIA after fix for #269904 in
  trusty-updates

Status in Compiz:
  Fix Committed
Status in Compiz 0.9.11 series:
  Fix Committed
Status in compiz package in Ubuntu:
  Fix Released
Status in compiz source package in Trusty:
  Fix Released

Bug description:
  [ Impact ]

  Immediately after the fix for #269904 landed in trusty-updates via
  compiz 1:0.9.11.3+14.04.20150122-0ubuntu1, my 14.04 machine with an
  NVIDIA card and using the nvidia-304 driver became unusable -- symtoms
  include compiz process high CPU (100%), UI freeze right after logging
  in (machine still up, reachable via SSH from the network), and a flood
  of these messages on the system log.

  [ Test Case ]

  Requires a GeForce 6150SE or similar integrated GPU from nVidia.
  Problem manifests immediately on login.

  [ Regression Potential ]

  The fix involves a specific hardware blacklist.  Anticipated
  regressions include fixed support for the specific hard in future
  nVidia driver releases and potentially additional unidentified
  hardware affected by this bug needing to be added to the blacklist.

  Note that there is a manual workaround to the problem consisting of
  disabling the X11 Sync feature through CCSM.

  [ Other Info ]

  This fix was cherry-picked from the Ubuntu "Vivid Vervet" development
  release where it has been in regular use for some weeks.

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