From: Tarkan Erimer on
When I booted into 2.6.33, hard lock up occurs via the following error
message at boot time :

[drm:drm_fb_helper_panic] *ERROR* panic occured, switching back to text
BUG: scheduling while atomic: init/1/0x00000002

This is a KMS enabled kernel on i945 VGA. Also, I tried (I found after
googling a bit.) with "i915.modeset=0 enable_mtrr_cleanup" and
"enable_mtrr_cleanup" kernel boot options. But, still the same error

This bug occurs on kernels from 2.6.33 to 2.6.33-git9. 2.6.33-rc8 works
fine. My .config attached.