root@UbuntuPC:~# uname -a
Linux UbuntuPC 2.6.38-11-generic #48-Ubuntu SMP Fri Jul 29 19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

root@UbuntuPC:~# lspci -v -s 01:00.0
01:00.0 VGA compatible controller: ATI Technologies Inc Cedar PRO [Radeon HD 5450] (prog-if 00 [VGA controller])
	Subsystem: XFX Pine Group Inc. Device 3035
	Flags: bus master, fast devsel, latency 0, IRQ 42
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Memory at f0300000 (64-bit, non-prefetchable) [size=128K]
	I/O ports at 2000 [size=256]
	Expansion ROM at f0340000 [disabled] [size=128K]
	Capabilities: [50] Power Management version 3
	Capabilities: [58] Express Legacy Endpoint, MSI 00
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
	Capabilities: [150] Advanced Error Reporting
	Kernel driver in use: radeon
	Kernel modules: radeon

Aug 31 23:49:19 UbuntuPC kernel: [15790.198604] ------------[ cut here ]------------
Aug 31 23:49:19 UbuntuPC kernel: [15790.198632] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [
Aug 31 23:49:19 UbuntuPC kernel: [15790.198635] Hardware name:         
Aug 31 23:49:19 UbuntuPC kernel: [15790.198637] GPU lockup (waiting for 0x000F5786 last fence id 0x000F5781)
Aug 31 23:49:19 UbuntuPC kernel: [15790.198639] Modules linked in: rfcomm binfmt_misc sco bnep l2cap parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_realtek p
Aug 31 23:49:19 UbuntuPC kernel: [15790.198687] Pid: 1758, comm: compiz Tainted: G        W I 2.6.38-11-generic #48-Ubuntu
Aug 31 23:49:19 UbuntuPC kernel: [15790.198689] Call Trace:
Aug 31 23:49:19 UbuntuPC kernel: [15790.198696]  [<ffffffff81065cbf>] ? warn_slowpath_common+0x7f/0xc0
Aug 31 23:49:19 UbuntuPC kernel: [15790.198701]  [<ffffffff81065db6>] ? warn_slowpath_fmt+0x46/0x50
Aug 31 23:49:19 UbuntuPC kernel: [15790.198718]  [<ffffffffa01447cf>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198723]  [<ffffffff81087fb0>] ? autoremove_wake_function+0x0/0x40
Aug 31 23:49:19 UbuntuPC kernel: [15790.198738]  [<ffffffffa01450b1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198747]  [<ffffffffa00eab0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198755]  [<ffffffffa00ed7e6>] ? ttm_bo_move_accel_cleanup+0x1c6/0x260 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198769]  [<ffffffffa014536f>] ? radeon_move_blit.clone.0+0x11f/0x180 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198783]  [<ffffffffa0145685>] ? radeon_move_ram_vram.clone.2+0x125/0x150 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198787]  [<ffffffff81124517>] ? vma_prio_tree_next+0x47/0x70
Aug 31 23:49:19 UbuntuPC kernel: [15790.198795]  [<ffffffffa00f03db>] ? ttm_eu_list_ref_sub+0x3b/0x60 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198808]  [<ffffffffa0145898>] ? radeon_bo_move+0x1e8/0x1f0 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198816]  [<ffffffffa00eb89e>] ? ttm_bo_handle_move_mem+0x12e/0x3d0 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198823]  [<ffffffffa00ec982>] ? ttm_bo_move_buffer+0x142/0x160 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198831]  [<ffffffffa00f03db>] ? ttm_eu_list_ref_sub+0x3b/0x60 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198838]  [<ffffffffa00eca36>] ? ttm_bo_validate+0x96/0x120 [ttm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198852]  [<ffffffffa014683c>] ? radeon_bo_list_validate+0x7c/0xe0 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198871]  [<ffffffffa015f6c6>] ? radeon_cs_parser_relocs+0x236/0x270 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198888]  [<ffffffffa015fb51>] ? radeon_cs_ioctl+0xa1/0x1e0 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198893]  [<ffffffff81134b63>] ? vma_link+0xc3/0x100
Aug 31 23:49:19 UbuntuPC kernel: [15790.198904]  [<ffffffffa000d384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198920]  [<ffffffffa015fab0>] ? radeon_cs_ioctl+0x0/0x1e0 [radeon]
Aug 31 23:49:19 UbuntuPC kernel: [15790.198926]  [<ffffffff811764ff>] ? do_vfs_ioctl+0x8f/0x360
Aug 31 23:49:19 UbuntuPC kernel: [15790.198930]  [<ffffffff81176861>] ? sys_ioctl+0x91/0xa0
Aug 31 23:49:19 UbuntuPC kernel: [15790.198934]  [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
Aug 31 23:49:19 UbuntuPC kernel: [15790.198937] ---[ end trace a7919e7f17c0a72a ]---
Aug 31 23:49:19 UbuntuPC kernel: [15790.200201] radeon 0000:01:00.0: GPU softreset 
Aug 31 23:49:19 UbuntuPC kernel: [15790.200204] radeon 0000:01:00.0:   GRBM_STATUS=0xB2733828
Aug 31 23:49:19 UbuntuPC kernel: [15790.200207] radeon 0000:01:00.0:   GRBM_STATUS_SE0=0x1C000007
Aug 31 23:49:19 UbuntuPC kernel: [15790.200210] radeon 0000:01:00.0:   GRBM_STATUS_SE1=0x00000007
Aug 31 23:49:19 UbuntuPC kernel: [15790.200212] radeon 0000:01:00.0:   SRBM_STATUS=0x20000AC0
Aug 31 23:49:19 UbuntuPC kernel: [15790.200275] radeon 0000:01:00.0:   GRBM_SOFT_RESET=0x00007F6B
Aug 31 23:49:19 UbuntuPC kernel: [15790.200379] radeon 0000:01:00.0:   GRBM_STATUS=0x00003828
Aug 31 23:49:19 UbuntuPC kernel: [15790.200381] radeon 0000:01:00.0:   GRBM_STATUS_SE0=0x00000007
Aug 31 23:49:19 UbuntuPC kernel: [15790.200384] radeon 0000:01:00.0:   GRBM_STATUS_SE1=0x00000007
Aug 31 23:49:19 UbuntuPC kernel: [15790.200386] radeon 0000:01:00.0:   SRBM_STATUS=0x200000C0
Aug 31 23:49:19 UbuntuPC kernel: [15790.201388] radeon 0000:01:00.0: GPU reset succeed
Aug 31 23:49:19 UbuntuPC kernel: [15790.222196] radeon 0000:01:00.0: WB enabled
Aug 31 23:49:19 UbuntuPC kernel: [15790.238318] [drm] ring test succeeded in 1 usecs
Aug 31 23:49:19 UbuntuPC kernel: [15790.238323] [drm] ib test succeeded in 1 usecs