I have some the same problem its a hit and miss, it seems like it only happens after it has been suspended overnight or for long periods of time I am also running Karmic i386 and my laptop in a Sony Vaio VGN-NR160E.
I have some the same problem its a hit and miss, it seems like it only happens after it has been suspended overnight or for long periods of time I am also running Karmic i386 and my laptop in a Sony Vaio VGN-NR160E.