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[Joris <joris.vandyck@xxxxxxxxxxxxx>]

I confirm this problem with xserver-xorg-video-intel version 2:2.99.917 (the latest version at time of writing).
When I run in SNA mode, everything works perfectly until the machine resumes from suspend. After this everything becomes unbearably sluggish and it seems hardware acceleration no longer works (slow scrolling, video playback doesn't work, etc). Also once in a while I get the artifacts other people describe (distorted fonts, weird window titles, etc). This doesn't always happen though.

This bug also seems to occur even without suspending, when using it for
sufficiently long time, probably triggered by something (at this point
not sure what).

I tried to change to UXA mode which only partly solves the problem. Here
I don't get the weird artifacts, but the hardware acceleration doesn't
seem to work at all (no video acceleration, weird scroll even in file
manager, etc).

-- 
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https://bugs.launchpad.net/bugs/1452318

Title:
  Faulty behavior when resuming from suspend

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  Waking from suspend, everything seems normal, except the graphical
  elements and text on my desktop are not drawn properly. Sometimes,
  moving the mouse over icons can cause them to be redrawn, sometimes
  not. It appears not to matter how I initiate the suspend (e.g. by
  closing laptop lid, or by calling pm-suspend explicitly) and it
  appears not to matter whether I am using an external display or the
  laptop's own screen.

  All other hardware appears to be working, and I can restart the laptop
  by clicking where the icons ought to be. The only symptom seems to be
  that the drawing does not happen correctly.

  I'm not sure what additional information I should provide to help
  diagnose the problem, so please advise me.

  Also, if this is more likely to be a xfce issue, then please change
  the package on the bug report.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: pm-utils 1.4.1-15
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  NonfreeKernelModules: openafs
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed May  6 17:17:51 2015
  InstallationDate: Installed on 2015-05-04 (1 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  PackageArchitecture: all
  SourcePackage: pm-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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