------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x360 [radeon]()
Hardware name: VPCEB3C5E
GPU lockup (waiting for 0x00079DB9 last fence id 0x00079DB5)
Modules linked in: snd_seq_dummy rfcomm sco bnep l2cap btusb bluetooth binfmt_misc parport_pc ppdev dm_crypt joydev snd_hda_codec_hdmi snd_hda_codec_realtek arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi ath9k snd_rawmidi snd_seq_midi_event mac80211 snd_seq ath9k_common uvcvideo ath9k_hw ath videodev cfg80211 snd_timer snd_seq_device psmouse serio_raw snd soundcore snd_page_alloc sony_laptop lp parport radeon ttm usbhid drm_kms_helper hid drm ahci sdhci_pci libahci sky2 sdhci i2c_algo_bit video
Pid: 7230, comm: Xorg Tainted: G        W   2.6.38-6-generic-pae #34-Ubuntu
Call Trace:
 [<c1058c92>] ? warn_slowpath_common+0x72/0xa0
 [<f8e67eaa>] ? radeon_fence_wait+0x2ea/0x360 [radeon]
 [<f8e67eaa>] ? radeon_fence_wait+0x2ea/0x360 [radeon]
 [<c1058d63>] ? warn_slowpath_fmt+0x33/0x40
 [<f8e67eaa>] ? radeon_fence_wait+0x2ea/0x360 [radeon]
 [<c1076a90>] ? autoremove_wake_function+0x0/0x50
 [<f8e68731>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<f8cb1719>] ? ttm_bo_wait+0xd9/0x170 [ttm]
 [<f8e80782>] ? radeon_gem_wait_idle_ioctl+0x82/0xe0 [radeon]
 [<f8454db1>] ? drm_ioctl+0x1e1/0x470 [drm]
 [<f8e80700>] ? radeon_gem_wait_idle_ioctl+0x0/0xe0 [radeon]
 [<c1013b00>] ? restore_i387_xstate+0xf0/0x210
 [<c113224c>] ? rw_verify_area+0x6c/0x130
 [<f8454bd0>] ? drm_ioctl+0x0/0x470 [drm]
 [<c1141c0b>] ? do_vfs_ioctl+0x7b/0x2e0
 [<c1009cde>] ? restore_sigcontext+0xbe/0xe0
 [<c1141ef7>] ? sys_ioctl+0x87/0x90
 [<c100ab5f>] ? sysenter_do_call+0x12/0x28
---[ end trace 22d37a9397875dc3 ]---