Hi Rafi,
avivotool can be used to assist in debugging this issue. avivotool is provided
with the radeontool package, so to install it run:
sudo apt-get install radeontool
After installing it, you run it like this:
avivotool regs all > regdump_good.txt
avivotool regs all > regdump_b
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/41656014/BootDmesg.txt
** Attachment added: "CurrentDmesg.txt"
http://launchpadlibrarian.net/41656015/CurrentDmesg.txt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/41656016/Dependencies.txt
** A