------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/drivers/gpu/drm/radeon/radeon_fence.c:235 radeon_fence_wait+0x23e/0x290 [radeon]()
Hardware name: U230
GPU lockup (waiting for 0x0000511D last fence id 0x0000510C)
Modules linked in: aes_i586 aes_generic binfmt_misc parport_pc ppdev snd_hda_codec_atihdmi snd_hda_codec_realtek arc4 snd_hda_intel radeon snd_hda_codec snd_hwdep snd_pcm snd_seq_midi ath9k snd_rawmidi ath9k_common snd_seq_midi_event ath9k_hw snd_seq ttm ath mac80211 drm_kms_helper snd_timer snd_seq_device drm cfg80211 hid_drff ff_memless snd k8temp joydev agpgart i2c_algo_bit psmouse serio_raw led_class soundcore snd_page_alloc shpchp i2c_piix4 video output lp parport usbhid hid usb_storage ahci r8169 libahci mii pata_atiixp
Pid: 1129, comm: Xorg Not tainted 2.6.35-15-generic #21-Ubuntu
Call Trace:
 [<c014a6e2>] warn_slowpath_common+0x72/0xa0
 [<f879d1ae>] ? radeon_fence_wait+0x23e/0x290 [radeon]
 [<f879d1ae>] ? radeon_fence_wait+0x23e/0x290 [radeon]
 [<c014a7b3>] warn_slowpath_fmt+0x33/0x40
 [<f879d1ae>] radeon_fence_wait+0x23e/0x290 [radeon]
 [<c01657c0>] ? autoremove_wake_function+0x0/0x50
 [<f879d8d1>] radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<f8421e67>] ttm_bo_wait+0xe7/0x180 [ttm]
 [<f87b2e19>] radeon_gem_wait_idle_ioctl+0x89/0x110 [radeon]
 [<f829e987>] drm_ioctl+0x1a7/0x400 [drm]
 [<f87b2d90>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
 [<c010afb2>] ? restore_i387_xstate+0xe2/0x210
 [<c0217dd2>] ? rw_verify_area+0x62/0xd0
 [<c0225e52>] vfs_ioctl+0x32/0xb0
 [<f829e7e0>] ? drm_ioctl+0x0/0x400 [drm]
 [<c02266e9>] do_vfs_ioctl+0x79/0x2d0
 [<c01021d6>] ? restore_sigcontext+0xc6/0xe0
 [<c02269a7>] sys_ioctl+0x67/0x80
 [<c05c9904>] syscall_call+0x7/0xb
---[ end trace bbd0df2d673d3d0b ]---