------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/drivers/gpu/drm/radeon/radeon_fence.c:235 radeon_fence_wait+0x24e/0x2b0 [radeon]()
Hardware name: Inspiron 1545                   
GPU lockup (waiting for 0x00048FE7 last fence id 0x00048FE6)
Modules linked in: nls_iso8859_1 nls_cp437 btrfs zlib_deflate crc32c libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs binfmt_misc parport_pc ppdev dm_crypt joydev snd_hda_codec_idt arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event b43 mac80211 snd_seq snd_timer snd_seq_device cfg80211 dell_wmi snd dell_laptop dcdbas psmouse serio_raw led_class soundcore snd_page_alloc lp parport dm_raid45 xor radeon ttm drm_kms_helper drm intel_agp usb_storage ahci ssb agpgart i2c_algo_bit libahci sky2 video output
Pid: 1208, comm: Xorg Tainted: G        W   2.6.35-22-generic-pae #33-Ubuntu
Call Trace:
 [<c01527b2>] warn_slowpath_common+0x72/0xa0
 [<f8770a4e>] ? radeon_fence_wait+0x24e/0x2b0 [radeon]
 [<f8770a4e>] ? radeon_fence_wait+0x24e/0x2b0 [radeon]
 [<c0152883>] warn_slowpath_fmt+0x33/0x40
 [<f8770a4e>] radeon_fence_wait+0x24e/0x2b0 [radeon]
 [<c016e100>] ? autoremove_wake_function+0x0/0x50
 [<f8771181>] radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<f862ce77>] ttm_bo_wait+0xe7/0x180 [ttm]
 [<f87878a9>] radeon_gem_wait_idle_ioctl+0x89/0x110 [radeon]
 [<f85b8b2d>] drm_ioctl+0x1ad/0x430 [drm]
 [<f8787820>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
 [<c01fd84f>] ? handle_mm_fault+0x3df/0x510
 [<c05f350d>] ? do_page_fault+0x1cd/0x440
 [<c0230552>] vfs_ioctl+0x32/0xb0
 [<f85b8980>] ? drm_ioctl+0x0/0x430 [drm]
 [<c0230de9>] do_vfs_ioctl+0x79/0x2d0
 [<c02310a7>] sys_ioctl+0x67/0x80
 [<c010939f>] sysenter_do_call+0x12/0x28
---[ end trace 8ca1796ebc2f9bf3 ]---