Try to install the latest openchrome drivers and check again:
http://launchpadlibrarian.net/59551835/xserver-xorg-video-openchrome_0.2.904%2Bsvn858-1_i386.deb
http://launchpadlibrarian.net/59553982/xserver-xorg-video-openchrome_0.2.904%2Bsvn858-1_amd64.deb
** Changed in: xserver-xorg-video-openchrome (Ubuntu)
Importance: Undecided => Low
** Changed in: xserver-xorg-video-openchrome (Ubuntu)
Status: Confirmed => Incomplete
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[P4M900] Loggout gives a black screen instead of swithing to the welcome
screen, when the latter is already open
https://bugs.launchpad.net/bugs/578369
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