I have same problem on 12.04 using different kernel 3.2/3.4/3.6 
The issue is for me visible only in Never Winter Night ( linux native version):
- cpu intensive use and heat
- render artifacts 

Render Artifacts are experimented only when I wear some special object in the 
game.
Cpu intensive use is bug as well, the game is very old and my pc is i5 + 4 gb ( 
during the game play temperature goes 90' degree and my pc shutdown, I have a 
notebook )

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https://bugs.launchpad.net/bugs/829086

Title:
  Artifacts in 3D with Sandy Bridge

Status in Mesa:
  Fix Released
Status in “mesa” package in Ubuntu:
  Fix Released

Bug description:
  I am experiencing serious artifacts with the Sandy Bridge graphics
  card when doing 3D.  Because we are trying to use this card at work, I
  have been testing this card for the last 2 months trying to get it to
  work with no luck, so I have done quite a lot of testing towards this
  and have found nothing so far that fixes this issue.

  This bug seems to happen to certain parts of the 3D scene only, it
  happens with our software quite badly which uses Panda 3D (I will
  attach a screenshot), but it is not limited to Panda 3D or our
  software at all because it also happens with Extreme Tux Racer if you
  look closely at the trees when you pause the game (I have taken a
  screenshot of this too).

  What you will notice is a pattern of dots (artifacts) in certain areas
  of the 3D scene, also the dots flicker like snow, which the
  screenshots cannot show exactly.  I have marked the areas that have
  artifacts in Extreme Tux Racer in red, but in the screenshot of our
  software it is so bad I don't even need to mark this.

  I am using Ubuntu Natty 32 bit, I have tried the following:

  * Intel drivers supplied with natty (2.14) and mesa supplied with natty 
(7.10.2)
  * Cutting edge Intel drivers and mesa 7.12 prerelease from Xorg edgers
  * Intel drivers 2.15 from various PPA's with Mesa 7.11 GIT pre-release
  * Intel drivers 2.15, Linux 3.0, Mesa 7.11 final release from Michael Kuhn PPA
  * Linux 3.0, Mesa 7.11 final from Michael Kuhn PPA + latest Intel 2.16 
drivers from Xorg edgers
  * Both HD2000 and HD3000 model CPUs do it (both Core i3)
  * I have experimented with turning different settings on and off using 
driconf, but it still happens

  I have also tried to install Oneiric Alpha 3 32 bit, but the desktop
  CD crashes half way during the install, the alternative CD crashes
  during the install when it asks for the language because it doesn't
  like USB keyboards, and the server CD also crashes, before it can even
  start, so I cannot install Oneiric at this point to test it.

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