Hi Alwin Garside,
radeontool can be used to assist in debugging this issue. To install it from
the command line, use this command:
sudo apt-get install radeontool
After installing it, you run it like this:
sudo radeontool regmatch '*' > regdump_good.txt
sudo radeontool regmatch '*'
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Confirmed
--
[Lucid] black screen when switching users
https://bugs.launchpad.net/bugs/555298
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** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu)
--
[Lucid] black screen when switching users
https://bugs.launchpad.net/bugs/555298
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** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/43102063/BootDmesg.txt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/43102064/Dependencies.txt
** Attachment added: "GdmLog.txt"
http://launchpadlibrarian.net/43102065/GdmLog.txt
** Attachment ad