I have Ubuntu 12.04 on a Toshiba laptop. About one out of every three times, when waking from suspend, it wakes up normally and works for anywhere from 10-45 seconds, then the screen goes black, then ...
So, as a number of users seem to be experiencing, I am unable to change brightness on my laptop. Using the Brightness and Lock in settings, the slider moves but brightness does not adjust. The fn keys ...