Ubuntu 14.04 случайно зависает (DRM)

Это случайное замораживание происходит уже несколько месяцев. Я полагаю, что проблема заключается в Direct Rendering Manager (DRM).

Из журнала ядра:

dalius@PC1124:~$ cat /var/log/kern.log | grep drm
Sep  8 17:23:44 PC1124 kernel: [   25.515278] [drm] Initialized drm 1.1.0 20060810
Sep  8 17:23:44 PC1124 kernel: [   26.027712] [drm] Memory usable by graphics device = 2048M
Sep  8 17:23:44 PC1124 kernel: [   26.027719] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
Sep  8 17:23:44 PC1124 kernel: [   26.072105] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Sep  8 17:23:44 PC1124 kernel: [   26.072108] [drm] Driver supports precise vblank timestamp query.
Sep  8 17:23:45 PC1124 kernel: [   26.190925] fbcon: inteldrmfb (fb0) is primary device
Sep  8 17:23:45 PC1124 kernel: [   26.265140] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Sep  8 17:23:45 PC1124 kernel: [   26.265742] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
Sep  8 18:21:25 PC1124 kernel: [ 3497.804013] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle
Sep  9 09:12:37 PC1124 kernel: [   36.280400] [drm] Initialized drm 1.1.0 20060810
Sep  9 09:12:37 PC1124 kernel: [   36.535447] [drm] Memory usable by graphics device = 2048M
Sep  9 09:12:37 PC1124 kernel: [   36.535454] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
Sep  9 09:12:37 PC1124 kernel: [   36.592545] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Sep  9 09:12:37 PC1124 kernel: [   36.592547] [drm] Driver supports precise vblank timestamp query.
Sep  9 09:12:37 PC1124 kernel: [   36.711561] fbcon: inteldrmfb (fb0) is primary device
Sep  9 09:12:37 PC1124 kernel: [   36.789513] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Sep  9 09:12:37 PC1124 kernel: [   36.791186] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
Sep 10 09:11:10 PC1124 kernel: [   35.714929] [drm] Initialized drm 1.1.0 20060810
Sep 10 09:11:10 PC1124 kernel: [   35.887189] [drm] Memory usable by graphics device = 2048M
Sep 10 09:11:10 PC1124 kernel: [   35.887199] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
Sep 10 09:11:10 PC1124 kernel: [   35.932129] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Sep 10 09:11:10 PC1124 kernel: [   35.932131] [drm] Driver supports precise vblank timestamp query.
Sep 10 09:11:10 PC1124 kernel: [   36.060649] fbcon: inteldrmfb (fb0) is primary device
Sep 10 09:11:10 PC1124 kernel: [   36.137382] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Sep 10 09:11:10 PC1124 kernel: [   36.147893] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
Sep 11 08:34:45 PC1124 kernel: [84264.804020] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle
Sep 11 09:07:46 PC1124 kernel: [   24.695604] [drm] Initialized drm 1.1.0 20060810
Sep 11 09:07:47 PC1124 kernel: [   25.412141] [drm] Memory usable by graphics device = 2048M
Sep 11 09:07:47 PC1124 kernel: [   25.412150] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
Sep 11 09:07:47 PC1124 kernel: [   25.456089] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Sep 11 09:07:47 PC1124 kernel: [   25.456092] [drm] Driver supports precise vblank timestamp query.
Sep 11 09:07:47 PC1124 kernel: [   25.574852] fbcon: inteldrmfb (fb0) is primary device
Sep 11 09:07:47 PC1124 kernel: [   25.649351] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Sep 11 09:07:47 PC1124 kernel: [   25.649523] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

Замораживание происходит на них:

dalius@PC1124:~$ cat /var/log/kern.log | grep drm | grep hang
Sep  8 18:21:25 PC1124 kernel: [ 3497.804013] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle
Sep 11 08:34:45 PC1124 kernel: [84264.804020] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle

[d3 ] После этого я не могу переключиться на tty1-tty6. В основном я вижу замороженный экран входа в систему, но это произошло во время обычного использования (в основном при использовании вкладки alt +). Единственное решение - это жесткая перезагрузка.

Asus P5G41T-M LX2 / GB (встроенная графика Intel GMA X4500)

Intel (R) Celeron ( R) CPU E3400

Полная информация HW: http://pastebin.com/JSuVy8CU

Любые предложения о том, как разрешить / отладить эту проблему, были оценены.