Display scrambles after a random amount of time

view full story

https://bbs.archlinux.org – Hello,I installed Arch Linux 2012.11.01 a few days ago and have been struggling with an annoying display problem.I installed and configured X exactly as described in the Beginners' Guide, ran xstart manually to confirm that it was working, and then set up a basic desktop of Slim, Openbox, Conky and Chromium.Everything worked fine initially but after a while the bottom half of the screen went black and the contents of the screen shrank to fit into the top half, wrapping horizontally. The session was still active - I could bump up the zoom in Chromium and continue working. Logging out and b (HowTos)