------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]()
Hardware name: Unknow
GPU lockup (waiting for 0x00000212 last fence id 0x0000020F)
Modules linked in: binfmt_misc vboxnetadp vboxnetflt vboxdrv lirc_imon(C) snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi arc4 ir_lirc_codec ppdev snd_seq_midi_event radeon snd_seq lirc_dev ttm parport_pc sp5100_tco drm_kms_helper snd_timer ir_sony_decoder drm zd1211rw lp i2c_algo_bit k8temp ir_jvc_decoder parport i2c_piix4 snd_seq_device ir_rc6_decoder ir_rc5_decoder rc_imon_pad ir_nec_decoder imon rc_core snd shpchp edac_core edac_mce_amd mac80211 soundcore cfg80211 psmouse serio_raw snd_page_alloc firewire_ohci usbhid hid ahci firewire_core crc_itu_t r8169 libahci pata_atiixp
Pid: 1311, comm: Xorg Tainted: G         C  2.6.38-7-generic #38-Ubuntu
Call Trace:
 [<ffffffff8106573f>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065836>] ? warn_slowpath_fmt+0x46/0x50
 [<ffffffffa02b966f>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
 [<ffffffff81087710>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa02b9f51>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<ffffffffa0240b0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
 [<ffffffffa0240e88>] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm]
 [<ffffffffa02d28e3>] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon]
 [<ffffffffa01ca384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
 [<ffffffffa02d2850>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
 [<ffffffff8100b7b1>] ? handle_signal+0x131/0x260
 [<ffffffff810156a1>] ? fpu_finit+0x21/0x40
 [<ffffffff810157ca>] ? init_fpu+0x4a/0x150
 [<ffffffff811751cf>] ? do_vfs_ioctl+0x8f/0x360
 [<ffffffff8100bd06>] ? sys_rt_sigreturn+0x106/0x140
 [<ffffffff81175531>] ? sys_ioctl+0x91/0xa0
 [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
---[ end trace f8073e019dde912c ]---