I have the same issues on an Asus laptop. It was well supported on 12.04 LTS but the 12.10 is obviously a big failure.
Not to speak about the system that slow down by itself, some swap mess I don't have time to fix, and the overall growing instability of the system tools. Memcheck segfault, then the report tool activate itself, inspect, segfault, launch again...
I also upgraded a pc of a friend from an good old athlon xp to a new shiny i3, and guess what the official, libre, graphic driver is just unable to run correctly, apparently because of a bad switch in an internal opcode.
Something is wrong here. The massive shift of devs from linux to OSX should warn some people somewhere about the overall quality of their stuff. A quality that we have been proud for decades.