Well I'm curious how this explains this -  I've taken current git -
changed the value to '44' - and I'm typing this text.  I could see a lot of 
errors during text typing - but these errors seems to be somehow limited only 
to certain regions of shown text.

It's not destroyed everywhere - only in some particularly piece and in
particular time - it's kind of weird defect to observe - and it also
happen for only some specific use-case

i.e. my text edit 'fte' which is using  X drawing code has absolutely no issue 
- all characters are always correct. 
But in firefox - typing this BZ I could see a lot of changing letters (usually 
everything after 10 letter on the line is weirdly changing - like if the font 
cache would be not working correctly.

Typing on keyboard shows rending bugs - as soon as right mouse button is
hit - everything is instantly redrawn correctly and pop window is shown.

Another thing I notice is -  I've about 20 lines of email headers in
thunderbird. And exactly only the 4th line is showing problems with
letters - even when I just move the mouse over the TB window - this text
is being continuously modified - but everything else in that window is
without any problem.

So if you say - there is hw bug - how is that  - it could very easily
render everything correctly ?

Why only certain portions of text have distortions - why it's not
randomly spread over the whole screen (which I'd have expected for time
collisions)?

-- 
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/1098489

Title:
  [gen4] Corruption in Chrome omni bar results using Intel SNA

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

Bug description:
  After enabling Intel SNA the favicons in the omnibar search results are 
corrupted.
  I've attached a screenshot of the issue with the bug report, note the favicon 
of the first result is corrupted.

  This bug is probably the same as bug #1098334, more information may be
  seen there.

  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: Fri Jan 11 15:31:21 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-12-03 (38 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64+mac 
(20121203)
  MarkForUpload: True
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ApportVersion: 2.8-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  DistUpgraded: Fresh install
  DistroCodename: raring
  DistroRelease: Ubuntu 13.04
  DistroVariant: kubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: No
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Device [106b:00dc]
  InstallationDate: Installed on 2012-12-03 (38 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64+mac 
(20121203)
  MachineType: Apple Inc. MacBookPro8,2
  MarkForUpload: True
  Package: xserver-xorg-video-intel 2:2.20.17-0ubuntu1
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.7.0-7-generic 
root=/dev/mapper/kubuntu-root ro quiet splash i915.lvds_channel_mode=2 
i915.modeset=1 i915.lvds_use_ssc=0 vt.handoff=7
  ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0
  Tags:  raring kubuntu single-occurrence
  Uname: Linux 3.7.0-7-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  XorgConf:
   Section "Device"
     Identifier "Card0"
     Driver "intel"
     Option "AccelMethod" "sna"
   EndSection
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-94245A3940C91C80
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245A3940C91C80
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80:
  dmi.product.name: MacBookPro8,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.40-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.1-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.1-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.1.901-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.0-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.17-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.6-0ubuntu1
  xserver.bootTime: Fri Jan 11 16:00:31 2013
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.1.901-0ubuntu1
  xserver.video_driver: intel

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