------------[ 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: EP45-DS3L
GPU lockup (waiting for 0x012B2BA1 last fence id 0x012B2B8F)
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat usb_storage uas snd_hrtimer binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek snd_ctxfi snd_usb_audio snd_hda_intel snd_usbmidi_lib snd_hda_codec snd_hwdep snd_seq_midi snd_pcm snd_seq_midi_event radeon snd_seq uvcvideo ppdev videodev v4l2_compat_ioctl32 snd_rawmidi snd_timer ttm snd_seq_device joydev drm_kms_helper drm psmouse parport_pc serio_raw snd soundcore i2c_algo_bit snd_page_alloc lp parport floppy hid_logitech ff_memless r8169 pata_jmicron usbhid hid
Pid: 15158, comm: Xorg Tainted: G        W   2.6.38-7-generic #39-Ubuntu
Call Trace:
 [<ffffffff8106573f>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065836>] ? warn_slowpath_fmt+0x46/0x50
 [<ffffffffa01c566f>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
 [<ffffffff81087710>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa01c5f51>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<ffffffffa0156b0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
 [<ffffffffa0156e88>] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm]
 [<ffffffffa01de8e3>] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon]
 [<ffffffffa0095384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
 [<ffffffffa01de850>] ? 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 cd92e404381cbd54 ]---