Please try to use the kernel parameter "nomodeset" or "radeon.modeset=0" and see if that help.
From bug: https://bugs.launchpad.net/ubuntu/lucid/+source/linux/+bug/545096
Please try to use the kernel parameter "nomodeset" or "radeon.modeset=0" and see if that help.
From bug: /bugs.launchpad .net/ubuntu/ lucid/+ source/ linux/+ bug/545096
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