I am running a fresh install of Ubuntu 12.10 with Cinnamon,
after roughly 10 minutes the screen turns black. I have set "Turn screen off when inactive for:" to "Never" or tried high values (1h +), this does not affect this behaviour. In the dconf-editor I located following entries:
setting to 0 did not have any effect
unsetting/unchecking did not have the desired effect
setting it to 0 or very high values (100k) did not have any effect.
do you have any suggestions on how to approach this issue? cheers peter