BUG: unable to handle kernel NULL pointer dereference at 000000fc
IP: [<f85728f1>] intel_release_load_detect_pipe+0x21/0xa0 [i915]
*pde = 3d3dd067 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/virtual/backlight/acpi_video0/actual_brightness
Modules linked in: binfmt_misc parport_pc ppdev snd_hda_codec_realtek arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm iwl3945 i915 snd_seq_midi snd_rawmidi drm_kms_helper snd_seq_midi_event iwlcore snd_seq mac80211 snd_timer drm snd_seq_device cfg80211 snd intel_agp i2c_algo_bit psmouse soundcore video serio_raw output snd_page_alloc agpgart lp parport usbhid hid r8169 mii

Pid: 991, comm: Xorg Not tainted 2.6.35-21-generic #31-Ubuntu HASEE/HASEE
EIP: 0060:[<f85728f1>] EFLAGS: 00013292 CPU: 1
EIP is at intel_release_load_detect_pipe+0x21/0xa0 [i915]
EAX: f858aa20 EBX: f1a02000 ECX: 00000003 EDX: ef6f2800
ESI: 00000000 EDI: f493b400 EBP: f484fcb0 ESP: f484fc98
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 991, ti=f484e000 task=ee890000 task.ti=f484e000)
Stack:
 7f0000aa f858aa20 ffffffff f1a02000 ffffffff f484fd98 f484fda8 f857f519
<0> f484fcc8 00000001 f1a02050 ef6f2800 00000003 00000000 00000000 00000000
<0> 00000000 4353544e 30383420 00000069 00000000 00000000 00000000 00000000
Call Trace:
 [<f857f519>] ? intel_tv_detect+0xa9/0x1b0 [i915]
 [<f84f078e>] ? drm_helper_probe_single_connector_modes+0x26e/0x310 [drm_kms_helper]
 [<f80df0ce>] ? drm_mode_object_find+0x4e/0x70 [drm]
 [<f80dfee7>] ? drm_mode_getconnector+0x2e7/0x380 [drm]
 [<c04c64a7>] ? snapshot_ctr+0x427/0x450
 [<f80d498d>] ? drm_ioctl+0x1ad/0x430 [drm]
 [<c04c64a7>] ? snapshot_ctr+0x427/0x450
 [<f80dfc00>] ? drm_mode_getconnector+0x0/0x380 [drm]
 [<c032e5b6>] ? apparmor_file_permission+0x16/0x20
 [<c0302a84>] ? security_file_permission+0x14/0x20
 [<c0218602>] ? rw_verify_area+0x62/0xd0
 [<c04c64a7>] ? snapshot_ctr+0x427/0x450
 [<c0226652>] ? vfs_ioctl+0x32/0xb0
 [<f80d47e0>] ? drm_ioctl+0x0/0x430 [drm]
 [<c0226ee9>] ? do_vfs_ioctl+0x79/0x2d0
 [<c02183e0>] ? do_sync_write+0x0/0xe0
 [<c02271a7>] ? sys_ioctl+0x67/0x80
 [<c04c64a7>] ? snapshot_ctr+0x427/0x450
 [<c05c8c54>] ? syscall_call+0x7/0xb
 [<c04c64a7>] ? snapshot_ctr+0x427/0x450
 [<c04c64a7>] ? snapshot_ctr+0x427/0x450
Code: 96 fe ff ff 5d c3 8d 74 26 00 55 89 e5 83 ec 18 89 5d f4 89 75 f8 89 7d fc 0f 1f 44 00 00 8b 70 20 8b 38 89 c3 8b 40 28 89 45 ec <8b> 86 fc 00 00 00 89 45 f0 80 7b 3c 00 75 28 80 7e 18 00 74 15 
EIP: [<f85728f1>] intel_release_load_detect_pipe+0x21/0xa0 [i915] SS:ESP 0068:f484fc98
CR2: 00000000000000fc
---[ end trace 9782391bb06af644 ]---