dmesg | grep drm
[    0.218747] [drm] Initialized drm 1.1.0 20060810
[    0.219987] [drm] Memory usable by graphics device = 2048M
[    0.220507] fb: conflicting fb hw usage inteldrmfb vs EFI VGA - removing generic driver
[    0.249844] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[    0.249847] [drm] Driver supports precise vblank timestamp query.
[    0.288389] [drm] Wrong MCH_SSKPD value: 0x16040307
[    0.288392] [drm] This can cause pipe underruns and display issues.
[    0.288394] [drm] Please upgrade your BIOS to fix this.
[    0.348493] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[    0.420853] fbcon: inteldrmfb (fb0) is primary device
[    0.817790] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    0.824072] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[    1.709966] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[  598.937723] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[  598.937728] [drm] capturing error event; look for more information in /sys/kernel/debug/dri/0/i915_error_state
[  598.946924] [drm:kick_ring] *ERROR* Kicking stuck wait on render ring

dmesg | grep i915
[    0.221638] i915 0000:00:02.0: setting latency timer to 64
[    0.249838] i915 0000:00:02.0: irq 42 for MSI/MSI-X
[    0.348493] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[    0.817790] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    0.817815] i915 0000:00:02.0: registered panic notifier
[    0.824072] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[  598.937723] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[  598.937728] [drm] capturing error event; look for more information in /sys/kernel/debug/dri/0/i915_error_state