Crash of Unity / Compiz : dock and panel disappear - HD5770

Binary package hint: unity

Hello,

Fresh install of Ubuntu Natty 11.04 alpha2 64 bits.

First time that Unity works with opensource drivers and graphic card ATI Radeon HD5770 (with last Linux Kernel, XOrg and Mesa).

Usually goes well but often, without a particular and repetable action, Unity and / or Compiz crashes : top panel and left dock completely disappear.

Sometimes all computer gets freezed, other times like here remaining is still usable.

Bug report with Ubuntu-bug Unity joined.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-1.28-generic 2.6.38-rc2
Uname: Linux 2.6.38-1-generic x86_64
Architecture: amd64
DRM.card0.DP.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes:
 edid-base64:
DRM.card0.HDMI.A.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes:
 edid-base64:
Date: Sat Feb 5 09:40:57 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard: Subsystem: Hightech Information System Ltd. Device [1787:2288]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
 LANGUAGE=fr_FR:fr:en_GB:en
 LANG=fr_FR.UTF-8
 LC_MESSAGES=fr_FR.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-1-generic root=UUID=24f8725b-363f-4e83-a0d1-628b4e3fb4d2 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-1.28-generic 2.6.38-rc2
SourcePackage: unity
dmi.bios.date: 08/20/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.60
dmi.board.name: P55 Pro
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.60:bd08/20/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnP55Pro:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz 1:0.9.2.1+glibmainloop4-0ubuntu9
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10-1ubuntu1
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.13.2+git20110124.fadee040-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-1ubuntu6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu4