------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x360 [radeon]()
Hardware name: Studio 1737
GPU lockup (waiting for 0x0000017E last fence id 0x00000176)
Modules linked in: binfmt_misc parport_pc ppdev rfcomm snd_hda_codec_hdmi sco snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm bnep l2cap snd_seq_midi snd_rawmidi snd_seq_midi_event arc4 snd_seq snd_timer snd_seq_device iwlagn radeon iwlcore uvcvideo joydev mac80211 snd soundcore btusb r852 sm_common nand nand_ids nand_ecc mtd cfg80211 snd_page_alloc videodev psmouse usbhid serio_raw ttm drm_kms_helper hid bluetooth drm i2c_algo_bit lp video dell_wmi dell_laptop dcdbas sparse_keymap parport firewire_ohci ahci firewire_core sdhci_pci tg3 libahci crc_itu_t sdhci
Pid: 1185, comm: Xorg Not tainted 2.6.38-8-generic-pae #42-Ubuntu
Call Trace:
 [<c145cc68>] ? dev_ethtool+0x808/0xdb0
 [<c1058ce2>] ? warn_slowpath_common+0x72/0xa0
 [<f8aebf3a>] ? radeon_fence_wait+0x2ea/0x360 [radeon]
 [<f8aebf3a>] ? radeon_fence_wait+0x2ea/0x360 [radeon]
 [<c1058db3>] ? warn_slowpath_fmt+0x33/0x40
 [<f8aebf3a>] ? radeon_fence_wait+0x2ea/0x360 [radeon]
 [<c1076c70>] ? autoremove_wake_function+0x0/0x50
 [<f8aec7c1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<f8750719>] ? ttm_bo_wait+0xd9/0x170 [ttm]
 [<f8b048c2>] ? radeon_gem_wait_idle_ioctl+0x82/0xe0 [radeon]
 [<f8777db1>] ? drm_ioctl+0x1e1/0x470 [drm]
 [<f8b04840>] ? radeon_gem_wait_idle_ioctl+0x0/0xe0 [radeon]
 [<c1013b00>] ? restore_i387_xstate+0xf0/0x210
 [<c100b0f0>] ? common_interrupt+0x30/0x38
 [<c145cc68>] ? dev_ethtool+0x808/0xdb0
 [<f8777bd0>] ? drm_ioctl+0x0/0x470 [drm]
 [<c1141ecb>] ? do_vfs_ioctl+0x7b/0x2e0
 [<c1009cde>] ? restore_sigcontext+0xbe/0xe0
 [<c11421b7>] ? sys_ioctl+0x87/0x90
 [<c100ab5f>] ? sysenter_do_call+0x12/0x28
---[ end trace b3006dc2db1cb89e ]---