I have upgraded from Ubuntu Karma to Lucid, and it seems I have replaced one problem with another.
With Karma, the screen occasionally froze unexpectedly, forcing a REISUB. I am using a DELL monitor with an NVIDEA twin monitor card (working with one monitor).
Since I upgraded, these screen freezes appear to have disappeared (I don't know for sure yet - since I only upgraded 2 days ago). However, one annoying occurence is that when I leave the machine idle for a period of time and it goes to sleep. I am unable to wake it up - as teh keyboard/mouse is unresponsive (well until/unless I do a REISUB). All I get is a black screen which pulsates between pitch black and "grey" every 2 seconds or so.
I noticed though that if I catch the machine BEFORE it falls asleep - i.e. just as the monitor starts to dim, I can avert this farce. Also, when I put the machine into hibernate. It enters this same trance-like state, where the only way to wake it up is to do a REISUB.
Does anyone know how I may resolve this, as it really is getting quite tiresome.