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kernel BUG at /build/buildd/linux-2.6.35/drivers/gpu/drm/i915/i915_gem.c:4197!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/devices/virtual/backlight/acpi_video0/actual_brightness
Modules linked in: aes_i586 aes_generic binfmt_misc rfcomm sco parport_pc ppdev bnep l2cap snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep arc4 snd_pcm joydev snd_seq_midi snd_rawmidi i915 drm_kms_helper snd_seq_midi_event snd_seq snd_timer drm rtl8187 btusb mac80211 led_class snd_seq_device i2c_algo_bit cfg80211 snd uvcvideo videodev eeprom_93cx6 soundcore video toshiba_bluetooth lp intel_agp bluetooth output agpgart usbhid psmouse snd_page_alloc serio_raw v4l1_compat hid parport r8169 mii ahci libahci

Pid: 2635, comm: Xorg Not tainted 2.6.35-20-generic #29-Ubuntu Portable PC/Satellite L510
EIP: 0060:[<f88d0ebb>] EFLAGS: 00013282 CPU: 1
EIP is at i915_gem_object_unpin+0xbb/0xd0 [i915]
EAX: e657ca80 EBX: f6923400 ECX: 000344ff EDX: fffffffd
ESI: 00034000 EDI: f709a000 EBP: e5553dc8 ESP: e5553dbc
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 2635, ti=e5552000 task=e4b2cc20 task.ti=e5552000)
Stack:
 00000002 00000003 e4bbf290 e5553e4c f88d6ec3 f709a014 02e58000 00000000
<0> fffa3000 e5553e18 f88d425e f6923414 090bde6c 00000001 00000003 00000000
<0> 02e58000 00000003 f6923414 e4bbf290 f709a014 e4bbf290 00000000 f709a000
Call Trace:
 [<f88d6ec3>] ? i915_gem_do_execbuffer+0x723/0xc90 [i915]
 [<f88d425e>] ? i915_gem_shmem_pwrite_fast+0x3e/0x150 [i915]
 [<f88d7aca>] ? i915_gem_execbuffer2+0x4a/0x1b0 [i915]
 [<f88d7afc>] ? i915_gem_execbuffer2+0x7c/0x1b0 [i915]
 [<f87c698d>] ? drm_ioctl+0x1ad/0x430 [drm]
 [<f88d7a80>] ? i915_gem_execbuffer2+0x0/0x1b0 [i915]
 [<c05cbf5d>] ? do_page_fault+0x1cd/0x440
 [<c0226652>] ? vfs_ioctl+0x32/0xb0
 [<f87c67e0>] ? drm_ioctl+0x0/0x430 [drm]
 [<c0226ee9>] ? do_vfs_ioctl+0x79/0x2d0
 [<c02183e0>] ? do_sync_write+0x0/0xe0
 [<c02271a7>] ? sys_ioctl+0x67/0x80
 [<c05c8c04>] ? syscall_call+0x7/0xb
Code: d1 8b 50 5c 8d 48 58 8b 70 58 89 56 04 89 32 8b 97 00 10 00 00 89 8f 00 10 00 00 81 c7 fc 0f 00 00 89 78 58 89 50 5c 89 0a eb a7 <0f> 0b eb fe 0f 0b eb fe 8d b6 00 00 00 00 8d bc 27 00 00 00 00 
EIP: [<f88d0ebb>] i915_gem_object_unpin+0xbb/0xd0 [i915] SS:ESP 0068:e5553dbc
---[ end trace 17110f9bfd4fc496 ]---