Thank you for taking the time to report this bug and helping to make
Ubuntu better. Please run the command 'apport-collect 1158889' which
will attach necessary information for debugging this as an Xorg problem.
Thanks in advance.

** Package changed: ubuntu => xserver-xorg-video-intel (Ubuntu)

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1158889

Title:
  sandybridge m gt2+ GPU Lockup render.IPEHR:0x41800000

Status in “xserver-xorg-video-intel” package in Ubuntu:
  Incomplete

Bug description:
  The occurence of this error results in freezing of the screens. There seems 
to be some activity on the hard drive and the network ports, so it looks like 
it's only affecting the display drivers. Occurrence of this error requires a 
hard reboot most of the time.  Some times it is captured by the Apport package 
and we get to see the details of the crash. We have been extending the screen 
to a monitor.  Also this is a machine that is used for extensive software 
development purpose.
  Running Ubuntu 12.04 LTR
  Lenovo T420 running intel core i5

  This is now happening on 2 Lenovo t420's here in our office.

  Package reported as xserver-xorg-video-intel 2:2.17.0-1ubuntu4

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