------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x350 [radeon]()
Hardware name: HP Compaq 6531s
GPU lockup (waiting for 0x00023AFD last fence id 0x00023AFC)
Modules linked in: cryptd aes_i586 aes_generic parport_pc ppdev snd_hda_codec_analog arc4 radeon snd_hda_intel snd_hda_codec iwlagn snd_hwdep snd_pcm snd_seq_midi ttm binfmt_misc drm_kms_helper hp_wmi sparse_keymap snd_rawmidi iwlcore snd_seq_midi_event mac80211 drm snd_seq joydev psmouse uvcvideo serio_raw video snd_timer videodev snd_seq_device cfg80211 i2c_algo_bit snd hp_accel lis3lv02d input_polldev soundcore snd_page_alloc lp parport usbhid usb_storage hid uas ahci libahci sky2
Pid: 1454, comm: compiz Tainted: G          I 2.6.38-5-generic #32-Ubuntu
Call Trace:
 [<c104fa42>] ? warn_slowpath_common+0x72/0xa0
 [<f89055ea>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
 [<f89055ea>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
 [<c104fb13>] ? warn_slowpath_fmt+0x33/0x40
 [<f89055ea>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
 [<c106d360>] ? autoremove_wake_function+0x0/0x50
 [<f8905e51>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<f859f719>] ? ttm_bo_wait+0xd9/0x170 [ttm]
 [<f891ccd2>] ? radeon_gem_wait_idle_ioctl+0x82/0xe0 [radeon]
 [<f8572cd1>] ? drm_ioctl+0x1e1/0x470 [drm]
 [<f891cc50>] ? radeon_gem_wait_idle_ioctl+0x0/0xe0 [radeon]
 [<c11014d7>] ? handle_mm_fault+0xb7/0x120
 [<c150c900>] ? do_page_fault+0x0/0x490
 [<c150cb2f>] ? do_page_fault+0x22f/0x490
 [<f8572af0>] ? drm_ioctl+0x0/0x470 [drm]
 [<c113665b>] ? do_vfs_ioctl+0x7b/0x2e0
 [<c1136947>] ? sys_ioctl+0x87/0x90
 [<c1054f82>] ? sys_gettimeofday+0x32/0x70
 [<c15096f4>] ? syscall_call+0x7/0xb
 [<c1500000>] ? early_init_intel+0xf7/0x130
---[ end trace a7919e7f17c0a727 ]---