Try disabling DRI and see if it helps. For how to change xorg.conf on the live CD before X starts, see https://wiki.ubuntu.com/EdgyKnownIssues/59618
Add the option
Option "DRI" "off"
(and of course do not change to vesa like in the wiki instructions).
What's the PCI ID of your card? lspci -vvnn|grep "VGA compatible"
Try disabling DRI and see if it helps. For how to change xorg.conf on the live CD before X starts, see https:/ /wiki.ubuntu. com/EdgyKnownIs sues/59618
Add the option
Option "DRI" "off"
(and of course do not change to vesa like in the wiki instructions).
What's the PCI ID of your card? lspci -vvnn|grep "VGA compatible"