Comment 47 for bug 272406

They discuss about the problems with Bugs around the HD 3650. The problem: The machine hangs / freezes with 4 GB of memory. The workaround for these bugs are the removing of 2 GB of RAM. It seems, that the memory-allocation estimation of xorg has a bug, so the card can't allocate no memory.

Please see the following links to forums for further details.
http://forum.ubuntuusers.de/topic/treiber-fuer-ati-mobility-radeon-hd-3650-inst/
http://ubuntuforums.org/showthread.php?t=1139823&highlight=3650
and many others
Logs are attached to posts.

Thank you