GPU lockup+blackout on 2.6.35 with r600...

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After around 10-30 mins of typical usage (ie cairo rendering to
surfaces + compiz) on my Dell Studio 15 (model 1557), my R600 radeon
locks up, giving a blank screen.

The only information I have is a backtrace [1]. 'radeontool regs'
doesn't give anything - what information, /sys files etc would be
useful here, and would it be useful to log a freedesktop.org bug
report at this stage, assuming I haven't found a reliable reproducer?

OS is Ubuntu 10.10 development release, mesa 7.8.2, libdrm2 2.4.21.

Thanks,
  Daniel

--- [1]

radeon 0000:02:00.0: GPU lockup CP stall for more than 1000msec
------------[ cut here ]------------
WARNING: at /home/kernel-ppa/COD/linux/drivers/gpu/drm/radeon/radeon_fence.c:235
radeon_fence_wait+0x2b7/0x320 [radeon]()
Hardware name: Studio 1557
GPU lockup (waiting for 0x00008C35 last fence id 0x00008C33)
Modules linked in: binfmt_misc parport_pc ppdev kvm_intel kvm
microcode snd_hda_codec_atihdmi joydev ipt_REJECT xt_limit xt_tcpudp
ipt_addrtype xt_state snd_hda_codec_idt ip6table_filter ip6_tables
snd_hda_intel nf_nat_irc nf_conntrack_irc snd_hda_codec nf_nat_ftp
nf_nat snd_hwdep nf_conntrack_ipv4 snd_seq_midi arc4 snd_pcm
snd_rawmidi nf_defrag_ipv4 radeon nf_conntrack_ftp nf_conntrack
iptable_filter snd_seq_midi_event snd_seq ip_tables ttm iwlagn video
snd_timer uvcvideo x_tables snd_seq_device output drm_kms_helper lp
dell_laptop iwlcore drm videodev dcdbas dell_wmi v4l1_compat mac80211
i7core_edac parport v4l2_compat_ioctl32 snd psmouse edac_core
i2c_algo_bit soundcore cfg80211 snd_page_alloc serio_raw sdhci_pci
sdhci ahci libahci led_class r8169 mii btrfs zlib_deflate crc32c
libcrc32c
Pid: 1624, comm: Xorg Tainted: G      D     2.6.35-020635-generic #020635
Call Trace:
? radeon_fence_wait+0x2b7/0x320 [radeon]
warn_slowpath_common+0x90/0xc0
warn_slowpath_fmt+0x6e/0x70
? schedule_timeout+0x15a/0x2e0
? r600_irq_set+0x27d/0xc00 [radeon]
? radeon_ring_commit+0xa3/0xb0 [radeon]
? r100_gpu_cp_is_lockup+0xc2/0xd0 [radeon]
? r600_gpu_is_lockup+0x1cb/0x220 [radeon]
radeon_fence_wait+0x2b7/0x320 [radeon]
? autoremove_wake_function+0x0/0x40
radeon_sync_obj_wait+0x11/0x20 [radeon]
ttm_bo_wait+0x102/0x1b0 [ttm]
ttm_bo_move_accel_cleanup+0x19e/0x230 [ttm]
radeon_move_blit+0x124/0x170 [radeon]
radeon_bo_move+0xda/0x1a0 [radeon]
ttm_bo_handle_move_mem+0xec/0x370 [ttm]
ttm_bo_evict+0x1cc/0x270 [ttm]
? drm_mm_split_at_start+0x1d/0x80 [drm]
ttm_mem_evict_first+0xed/0x180 [ttm]
? ttm_bo_man_get_node+0xd5/0xe0 [ttm]
ttm_bo_mem_force_space+0xab/0x110 [ttm]
ttm_bo_mem_space+0x305/0x370 [ttm]
ttm_bo_move_buffer+0xcf/0x140 [ttm]
? drm_mm_split_at_start+0x1d/0x80 [drm]
ttm_bo_validate+0xd5/0x100 [ttm]
ttm_bo_init+0x1f2/0x240 [ttm]
radeon_bo_create+0x121/0x240 [radeon]
? radeon_ttm_bo_destroy+0x0/0x80 [radeon]
radeon_gem_object_create+0x89/0x100 [radeon]
? drm_gem_handle_create+0x8b/0xa0 [drm]
radeon_gem_create_ioctl+0x58/0xe0 [radeon]
drm_ioctl+0x283/0x460 [drm]
? radeon_gem_create_ioctl+0x0/0xe0 [radeon]
? do_readv_writev+0x16b/0x1e0
vfs_ioctl+0x3a/0xc0
do_vfs_ioctl+0x6d/0x1f0
sys_ioctl+0x87/0xa0
? sys_writev+0x55/0xb0
system_call_fastpath+0x16/0x1b
---[ end trace c0bc12025fa8386c ]---
radeon 0000:02:00.0: GPU softreset
radeon 0000:02:00.0:   R_008010_GRBM_STATUS=0xA0003028
radeon 0000:02:00.0:   R_008014_GRBM_STATUS2=0x00000002
radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200000C0
radeon 0000:02:00.0:   R_008020_GRBM_SOFT_RESET=0x00007FEE
radeon 0000:02:00.0: R_008020_GRBM_SOFT_RESET=0x00000001
radeon 0000:02:00.0:   R_008010_GRBM_STATUS=0x00003028
radeon 0000:02:00.0:   R_008014_GRBM_STATUS2=0x00000002
radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200000C0
radeon 0000:02:00.0: GPU reset succeed
Clocks initialized !
ring test succeeded in 1 usecs
ib test succeeded in 1 usecs
-- 
Daniel J Blueman
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