[Bug 1031784] Re: Artifacts on screen with ivy bridge

[Timo Aaltonen]

** Description changed:

+ [IMPACT]
+ 
+ renders IVB GT1 systems basically inoperable, with massive distortion on
+ screen
+ 
+ [TESTCASE]
+ 
+ boot 12.04 on a IVB GT1 (HD2500) system
+ 
+ [Regression Potential]
+ 
+ None, the changes are oneliners to reduce the max thread count on IVB
+ GT1, which matches the current (internal?) intel specs
+ 
+ --
+ 
  I have a Intel 3570 CPU (Ivy Bridge) with built in 2500 graphics [1].
  There is a lot of artifacts on screen, both in lightdm and in unity. There more or less impossibly to read any text on screen.
  I have tested quantal and the packages from ppa:xorg-edgers/ppa without any improvement. I had high hopes what xf86-video-intel 2.20.2 was the solution because it contains ivy bridge fixes, but still no result. [2]
  
  Note (link 2):
  "For the last 9 months, since 2.16.901, we have been shipping a driver that
  does not work on IvyBridge GT1 systems (HD2500 graphics); we were telling
  the GPU to use an invalid number of threads for the pixel shader and this
  in turned caused the GPU to hang."
  
  With a plain install of precise I only see artifacts, but X hangs (hard)
  when I'm using quantal or the packages from ppa:xorg-edgers/ppa
  
  My current ugly workaround is to remove the intel driver and let X fall
  back to something else, not a perfect solution but the system is usable.
  
  [1] http://ark.intel.com/products/65702/Intel-Core-i5-3570-Processor-%286M-Cache-3_40-GHz%29
  [2] http://lists.freedesktop.org/archives/xorg/2012-July/054947.html
  
  Currently the system is running 12.04 with ppa ppa:xorg-edgers/ppa.
  I have xserver-xorg-video-intel 2:2.20.2+git20120731.fd3a1236-0ubuntu0sarvatt~precise installed, the system hangs hard after I log in, or sometimes the GPU hangs and the screen goes to power save.
  
  The system is not in use and I'm free to install and test whatever
  version and/or packages you want me to install.

** Description changed:

  [IMPACT]
  
  renders IVB GT1 systems basically inoperable, with massive distortion on
  screen
+ 
+ also affects systems on the certification queue
  
  [TESTCASE]
  
  boot 12.04 on a IVB GT1 (HD2500) system
  
  [Regression Potential]
  
  None, the changes are oneliners to reduce the max thread count on IVB
  GT1, which matches the current (internal?) intel specs
  
  --
  
  I have a Intel 3570 CPU (Ivy Bridge) with built in 2500 graphics [1].
  There is a lot of artifacts on screen, both in lightdm and in unity. There more or less impossibly to read any text on screen.
  I have tested quantal and the packages from ppa:xorg-edgers/ppa without any improvement. I had high hopes what xf86-video-intel 2.20.2 was the solution because it contains ivy bridge fixes, but still no result. [2]
  
  Note (link 2):
  "For the last 9 months, since 2.16.901, we have been shipping a driver that
  does not work on IvyBridge GT1 systems (HD2500 graphics); we were telling
  the GPU to use an invalid number of threads for the pixel shader and this
  in turned caused the GPU to hang."
  
  With a plain install of precise I only see artifacts, but X hangs (hard)
  when I'm using quantal or the packages from ppa:xorg-edgers/ppa
  
  My current ugly workaround is to remove the intel driver and let X fall
  back to something else, not a perfect solution but the system is usable.
  
  [1] http://ark.intel.com/products/65702/Intel-Core-i5-3570-Processor-%286M-Cache-3_40-GHz%29
  [2] http://lists.freedesktop.org/archives/xorg/2012-July/054947.html
  
  Currently the system is running 12.04 with ppa ppa:xorg-edgers/ppa.
  I have xserver-xorg-video-intel 2:2.20.2+git20120731.fd3a1236-0ubuntu0sarvatt~precise installed, the system hangs hard after I log in, or sometimes the GPU hangs and the screen goes to power save.
  
  The system is not in use and I'm free to install and test whatever
  version and/or packages you want me to install.

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Title:
  Artifacts on screen with ivy bridge

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