Comment 657 for bug 993187

I have tested all kernels from 3.2_amd64-3.5_amd64 that were shipped via updates
and none worked for me.

After that i installed the 3.8.0-999_amd64 and tested with the options from #650
and as far as I can tell, the options 'powersave=0 i915.i915_enable_rc6=0'
did not fix the problem for me.

When using the 'i915.i915_enable_rc6=0' option, the X-Server behaves totally
weird (cancels session; displays TTY cursor on X-Screen...).

If I enable the option 'i915.i915_enable_rc6=1' (I know there are some other levels),
the X-Server behaves fine, but the complete computer freezes after some time
without any warning.

With the 'powersave=0' option everything is fine, even CPU frequencies are
adjusted dynamically.

After all that testing and other bug reports from NVIDIA/ATI users, I guess the problem
is located in a kernel driver for intel chipset (if the NVIDIA/ATI problem are not related to
old blob drivers).

What else speaks for a kernel bug is that I have still a 3.0.0-26 kernel running and everything
is fine with that version.

As I think this is a chipset problem this is my conf:
MB: Intel DH67CF
CPU: Core i5-2500K
GRAPHIC: Intel HD3000
RAM: 8GB
LINUX: Ubuntu 12.10 64Bit (kernel 3.0.0-26_amd64)

Maybe this helps to sort out the problem somewhat.