------------[ 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: GA-880GMA-UD2H
GPU lockup (waiting for 0x0000022B last fence id 0x00000228)
Modules linked in: binfmt_misc parport_pc ppdev gspca_sonixj gspca_main videodev v4l2_compat_ioctl32 snd_hda_codec_hdmi radeon snd_hda_codec_realtek snd_usb_audio snd_usbmidi_lib ttm snd_hda_intel snd_seq_midi snd_hda_codec snd_rawmidi drm_kms_helper snd_seq_midi_event drm snd_seq snd_hwdep snd_seq_device snd_pcm i2c_algo_bit snd_timer sp5100_tco serio_raw snd lp snd_page_alloc xhci_hcd i2c_piix4 edac_core shpchp soundcore joydev k10temp edac_mce_amd parport usb_storage firewire_ohci firewire_core usbhid hid uas crc_itu_t ahci pata_atiixp pata_jmicron libahci r8169
Pid: 1237, comm: Xorg Not tainted 2.6.38-8-generic #42-Ubuntu
Call Trace:
 [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
 [<ffffffffa02dd6df>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
 [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa02ddfc1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<ffffffffa0220b0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
 [<ffffffffa0220e88>] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm]
 [<ffffffffa02f69e3>] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon]
 [<ffffffffa016a384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
 [<ffffffffa02f6950>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
 [<ffffffff8100b7b1>] ? handle_signal+0x131/0x260
 [<ffffffff810156d1>] ? fpu_finit+0x21/0x40
 [<ffffffff810157fa>] ? init_fpu+0x4a/0x150
 [<ffffffff8117648f>] ? do_vfs_ioctl+0x8f/0x360
 [<ffffffff8100bd06>] ? sys_rt_sigreturn+0x106/0x140
 [<ffffffff811767f1>] ? sys_ioctl+0x91/0xa0
 [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
---[ end trace 942a829a01fce3f6 ]---