(In reply to comment #92)
> Removed an older hack and had to reduce the max further. Bah, humbugs.

OK, this time I'm definitely not able to reproduce the issue so far.
Maybe it will some extra time - hard to say now - but before it has took me 
just minutes to get the issue visible.

intel_gpu_top now shows only few lines busy to 1% during scroll.


The bad part is - while before I've been getting 3.7Mchar/s in x11perf 
-aa10text - now it's like 1.3Mchar/s  so significantly slower.

So the question here would be - isn't the corruption based on  triangle
surface size ? So i.e. GPU is able to  process a lot of small ones - but
has bug with bigger ones ?

Maybe a cheap test would be to flush when some longer triangle edge is
pushed in ?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1098334

Title:
  [gen4 sna] Font corruption in Chromium tab bar

Status in X.org xf86-video-intel:
  In Progress
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Triaged

Bug description:
  After enabling the SNA acceleration method and rebooting, I noticed
  that graphical glitches appeared in the letters on Chromium's tab bar
  during the mouse hover animation. I've attached a screenshot
  illustrating this, particularly with the letter "g" in the screenshot.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0
  Uname: Linux 3.7.0-7-generic x86_64
  ApportVersion: 2.8-0ubuntu1
  Architecture: amd64
  Date: Thu Jan 10 16:00:55 2013
  InstallationDate: Installed on 2012-09-24 (107 days ago)
  InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120822.2)
  MarkForUpload: True
  SourcePackage: xorg
  UpgradeStatus: Upgraded to raring on 2012-09-25 (107 days ago)

To manage notifications about this bug go to:
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