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[gene <593463@xxxxxxxxxxxxxxxxxx>]

Here's an update:
uname -a :
Linux  2.6.37-rc3-mine #1 SMP Sat Nov 27 19:08:07 CST 2010 x86_64 GNU/Linux
No drm/dri dropping so far, however, a gnome session is getting killed when some under a certain cpu/memory/disk usage load. When I tried to add a media to amarok I lost my gnome session and got to the gdm login. After logging in metacity was in use, I had to do "compiz --repace", which worked. 

Here is what I get in the kern.log:

Dec  2 11:57:14 my kernel: [397881.555436] 11:3:1: cannot get freq at ep 0x84
Dec  2 11:57:14 my kernel: [397881.579563] 11:3:1: cannot get freq at ep 0x84
Dec  2 12:54:18 my kernel: [401305.493365] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 12:54:19 my kernel: [401306.144713] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 12:54:19 my kernel: [401306.180669] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 12:54:19 my kernel: [401306.264823] [drm:i915_gem_object_bind_to_gtt] *ERROR* Attempting to bind a purgeable object
Dec  2 12:55:06 my kernel: [401353.309903] 11:3:1: cannot get freq at ep 0x84
Dec  2 12:55:06 my kernel: [401353.345028] 11:3:1: cannot get freq at ep 0x84
Dec  2 12:58:43 my kernel: [401571.028764] 11:3:1: cannot get freq at ep 0x84
Dec  2 12:58:43 my kernel: [401571.066888] 11:3:1: cannot get freq at ep 0x84
Dec  2 13:05:51 my kernel: [401998.422719] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:07:34 my kernel: [402101.878458] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:07:34 my kernel: [402101.878595] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:07:34 my kernel: [402101.878641] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:07:34 my kernel: [402101.878688] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:07:34 my kernel: [402101.878736] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.435529] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.437516] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.437594] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.437636] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.437676] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.438307] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.438435] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
Dec  2 13:09:58 my kernel: [402245.438566] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer
 The Xorg.0.log contains this :
[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x28) [0x4a33e8]
1: /usr/bin/X (mieqEnqueue+0x1f4) [0x4a2c64]
2: /usr/bin/X (xf86PostMotionEventP+0xc4) [0x47d044]
3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8fcd4a8000+0x53cf) [0x7f8fcd4ad3cf]
4: /usr/bin/X (0x400000+0x6fe47) [0x46fe47]
5: /usr/bin/X (0x400000+0x11d363) [0x51d363]
6: /lib/libpthread.so.0 (0x7f8fd1935000+0xf8f0) [0x7f8fd19448f0]
7: /lib/libc.so.6 (ioctl+0x7) [0x7f8fd06ec197]
8: /lib/libdrm.so.2 (drmIoctl+0x28) [0x7f8fcec9d5b8]
9: /lib/libdrm.so.2 (drmCommandNone+0x16) [0x7f8fcec9d8b6]
10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f8fce7ef000+0x27838) [0x7f8fce816838]
11: /usr/bin/X (0x400000+0x168a44) [0x568a44]
12: /usr/bin/X (0x400000+0xa58a0) [0x4a58a0]
13: /usr/bin/X (BlockHandler+0x50) [0x435df0]
14: /usr/bin/X (WaitForSomething+0x141) [0x45faa1]
15: /usr/bin/X (0x400000+0x30952) [0x430952]
16: /usr/bin/X (0x400000+0x261aa) [0x4261aa]
17: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7f8fd062cc4d]
18: /usr/bin/X (0x400000+0x25d59) [0x425d59]

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https://bugs.launchpad.net/bugs/593463

Title:
  [i945g] xsession crash and consecutive loss of dri/drm capability on i915