GPU lockup when using Launcher

[Tomas A. Haavet]

Quite often the screen freezes and goes black repeatedly when clicking on an active process in the Launcher bar in Ubuntu 11.04.

dmesg:
radeon 0000:02:00.0: GPU lockup CP stall for more than 10000msec
------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]()
Hardware name: System Product Name
GPU lockup (waiting for 0x00105E10 last fence id 0x00105DB0)
Modules linked in: binfmt_misc parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_realtek ahci snd_hda_intel snd_hda_codec snd_hwdep radeon snd_seq_midi snd_pcm snd_rawmidi ttm drm_kms_helper snd_seq_midi_event drm i7core_edac edac_core snd_seq nfsd snd_timer snd_seq_device asus_atk0110 snd psmouse soundcore snd_page_alloc serio_raw exportfs nfs lockd fscache nfs_acl auth_rpcgss usbhid lp sunrpc firewire_ohci i2c_algo_bit parport hid libahci r8169 firewire_core pata_jmicron crc_itu_t
Pid: 1019, comm: Xorg Tainted: G W 2.6.38-8-generic #42-Ubuntu
Call Trace:
 [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
 [<ffffffffa030a6df>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
 [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa032407d>] ? radeon_ib_get+0x12d/0x1e0 [radeon]
 [<ffffffffa0325a4e>] ? radeon_cs_ioctl+0x8e/0x1e0 [radeon]
 [<ffffffff8119e08d>] ? fsnotify+0x1cd/0x2e0
 [<ffffffffa026a384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
 [<ffffffffa03259c0>] ? radeon_cs_ioctl+0x0/0x1e0 [radeon]
 [<ffffffff8116571b>] ? do_readv_writev+0x19b/0x1e0
 [<ffffffff8117648f>] ? do_vfs_ioctl+0x8f/0x360
 [<ffffffff811767f1>] ? sys_ioctl+0x91/0xa0
 [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
---[ end trace 85a8a06d035d491d ]---
radeon 0000:02:00.0: GPU softreset
radeon 0000:02:00.0: GRBM_STATUS=0xF5702828
radeon 0000:02:00.0: GRBM_STATUS_SE0=0xFC000005
radeon 0000:02:00.0: GRBM_STATUS_SE1=0x00000007
radeon 0000:02:00.0: SRBM_STATUS=0x200000C0
radeon 0000:02:00.0: GRBM_SOFT_RESET=0x00007F6B
radeon 0000:02:00.0: GRBM_STATUS=0x00003828
radeon 0000:02:00.0: GRBM_STATUS_SE0=0x00000007
radeon 0000:02:00.0: GRBM_STATUS_SE1=0x00000007
radeon 0000:02:00.0: SRBM_STATUS=0x200000C0
radeon 0000:02:00.0: GPU reset succeed
radeon 0000:02:00.0: WB enabled
[drm] ring test succeeded in 1 usecs
[drm] ib test succeeded in 1 usecs

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: tomasah 2634 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfbaf8000 irq 70'
   Mixer name : 'Realtek ALC1200'
   Components : 'HDA:10ec0888,104383c0,00100101'
   Controls : 35
   Simple ctrls : 20
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xfbbfc000 irq 71'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100200'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Wed May 4 17:47:02 2011
HibernationDevice: RESUME=UUID=95d1b213-b846-4704-9c3f-a86606dd3252
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
MachineType: System manufacturer System Product Name
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=de7d682f-f706-4f50-97d4-4a092f4af7e1 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.52
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-05-04 (0 days ago)
dmi.bios.date: 02/24/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0805
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P6T SE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0805:bd02/24/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TSE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer