------------[ 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: System Product Name
GPU lockup (waiting for 0x000AC2D4 last fence id 0x000AC2D3)
Modules linked in: binfmt_misc snd_hda_codec_hdmi snd_hda_codec_via snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event radeon snd_seq ppdev ttm snd_timer snd_seq_device drm_kms_helper drm snd k10temp edac_core soundcore edac_mce_amd sp5100_tco i2c_algo_bit snd_page_alloc parport_pc i2c_piix4 asus_atk0110 shpchp lp parport usbhid hid ahci pata_atiixp libahci r8169
Pid: 1642, comm: compiz Tainted: G        W   2.6.38-8-generic #42-Ubuntu
Call Trace:
 [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
 [<ffffffffa019c6df>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
 [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa019cfc1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<ffffffffa00f9b0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
 [<ffffffffa00f9e88>] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm]
 [<ffffffffa01b59e3>] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon]
 [<ffffffffa00c1384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
 [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250
 [<ffffffffa01b5950>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
 [<ffffffff815c6af8>] ? do_page_fault+0x258/0x540
 [<ffffffff8117648f>] ? do_vfs_ioctl+0x8f/0x360
 [<ffffffff811767f1>] ? sys_ioctl+0x91/0xa0
 [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
---[ end trace b15934e91af11ab1 ]---