netbook edition hangs with radeon hardware

[HugoHirsch]

I just installed ubuntu-netbook on my 10.10 machine with all available updates. With gdm as login manager I select 'UNE' and hit start.

The following screen shows my background image and the menu panel, but the machine seems to freeze. If I switch to a text console I am able to restart gdm in order to use the machine again.

Last log message was:
[ 1124.403672] ptrace of non-child pid 4166 was attempted by: gdb (pid 4340)
with 4166 being mutter.

Package info is:
ubuntu-netbook:
  Installiert: 2.035
  Kandidat: 2.035
  Versionstabelle:
 *** 2.035 0
        500 http://de.archive.ubuntu.com/ubuntu/ maverick-updates/main i386 Packages
        100 /var/lib/dpkg/status
     2.034 0
        500 http://de.archive.ubuntu.com/ubuntu/ maverick/main i386 Packages
mutter:
  Installiert: 2.31.5-0ubuntu9
  Kandidat: 2.31.5-0ubuntu9
  Versionstabelle:
 *** 2.31.5-0ubuntu9 0
        500 http://de.archive.ubuntu.com/ubuntu/ maverick/main i386 Packages
        100 /var/lib/dpkg/status

Display adapter is:
01:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 01)
01:00.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (Secondary) (rev 01)

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: ubuntu-netbook 2.035
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
CheckboxSubmission: d7d9b16e9b357bb24336acc7d752d6c5
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Wed Nov 10 01:28:26 2010
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=de_DE.utf8
 SHELL=/bin/bash
SourcePackage: netbook-meta

[HugoHirsch (ubuntubugs-aiki-it)]

Attached X-logs.