[ 154.675238] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]()
[ 154.675244] Hardware name: MacBookPro8,2
[ 154.675248] GPU lockup (waiting for 0x000015D4 last fence id 0x000015D3)
[ 154.675252] Modules linked in: nfs lockd fscache nfs_acl auth_rpcgss sunrpc parport_pc ppdev binfmt_misc snd_hda_codec_hdmi snd_hda_codec_cirrus snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi radeon snd_seq_midi_event applesmc input_polldev joydev snd_seq ttm usb_storage uvcvideo drm_kms_helper snd_timer bcm5974 snd_seq_device uas snd videodev v4l2_compat_ioctl32 drm soundcore snd_page_alloc i2c_algo_bit video lp parport firewire_ohci firewire_core tg3 sdhci_pci sdhci crc_itu_t hid_apple usbhid hid
[ 154.675332] Pid: 1584, comm: compiz Not tainted 2.6.38-8-generic #41-Ubuntu
[ 154.675336] Call Trace:
[ 154.675352] [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
[ 154.675360] [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
[ 154.675391] [<ffffffffa02216df>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
[ 154.675402] [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
[ 154.675430] [<ffffffffa0221fc1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
[ 154.675445] [<ffffffffa01d3b0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
[ 154.675457] [<ffffffffa01d3e88>] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm]
[ 154.675494] [<ffffffffa023a9e3>] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon]
[ 154.675517] [<ffffffffa00c3384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
[ 154.675527] [<ffffffff81177100>] ? pollwake+0x0/0x60
[ 154.675560] [<ffffffffa023a950>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
[ 154.675570] [<ffffffff8117648f>] ? do_vfs_ioctl+0x8f/0x360
[ 154.675579] [<ffffffff811776c2>] ? poll_select_set_timeout+0x82/0x90
[ 154.675587] [<ffffffff811767f1>] ? sys_ioctl+0x91/0xa0
[ 154.675595] [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b