------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x350 [radeon]()
Hardware name: GA-MA785GMT-UD2H
GPU lockup (waiting for 0x000001C5 last fence id 0x000001C2)
Modules linked in: binfmt_misc vboxnetadp vboxnetflt vboxdrv dm_crypt snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device max6650 ppdev it87 snd parport_pc hwmon_vid k10temp soundcore snd_page_alloc lp parport sp5100_tco i2c_piix4 shpchp radeon firewire_ohci firewire_core ttm usbhid drm_kms_helper hid ahci drm crc_itu_t i2c_algo_bit pata_atiixp libahci r8169
Pid: 1098, comm: Xorg Not tainted 2.6.38-8-generic #42-Ubuntu
Call Trace:
 [<c104f912>] ? warn_slowpath_common+0x72/0xa0
 [<f828066a>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
 [<f828066a>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
 [<c104f9e3>] ? warn_slowpath_fmt+0x33/0x40
 [<f828066a>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
 [<c106d370>] ? autoremove_wake_function+0x0/0x50
 [<f8280ed1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<f80af719>] ? ttm_bo_wait+0xd9/0x170 [ttm]
 [<f8297d52>] ? radeon_gem_wait_idle_ioctl+0x82/0xe0 [radeon]
 [<f80c1cd1>] ? drm_ioctl+0x1e1/0x470 [drm]
 [<f8297cd0>] ? radeon_gem_wait_idle_ioctl+0x0/0xe0 [radeon]
 [<c100bde0>] ? restore_i387_xstate+0xf0/0x210
 [<c1105881>] ? do_mmap_pgoff+0x231/0x300
 [<f80c1af0>] ? drm_ioctl+0x0/0x470 [drm]
 [<c11367cb>] ? do_vfs_ioctl+0x7b/0x2e0
 [<c100225e>] ? restore_sigcontext+0xbe/0xe0
 [<c1136ab7>] ? sys_ioctl+0x87/0x90
 [<c1509bf4>] ? syscall_call+0x7/0xb
---[ end trace f503e720400c3297 ]---