I confirm this issue on a fresh installation with daily desktop image (20111003)
I attached the output of "LIBGL_DEBUG=verbose glxinfo" 

important bits:
libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/tls/i965_dri.so
libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/i965_dri.so
libGL error: failed to open drm device: Permission denied
libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/swrast_dri.so

and ck-list-sessions:
Session3:
        unix-user = '1000'
        realname = 'ubuntu'
        seat = 'Seat1'
        session-type = ''
        active = FALSE
        x11-display = ''
        x11-display-device = ''
        display-device = '/dev/tty1'
        remote-host-name = ''
        is-local = TRUE
        on-since = '2011-10-03T08:45:46.135467Z'
        login-session-id = ''
        idle-since-hint = '2011-10-03T09:09:06.602876Z'

** Tags added: rls-mgr-o-tracking

** Attachment added: "glxinfo.log"
   
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/863119/+attachment/2500119/+files/glxinfo.log

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https://bugs.launchpad.net/bugs/863119

Title:
  ~/xsession-errors is owned by root, incorrect consolekit session
  breaking DRI

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