I have a problem with suspend to disk. The problem is that when i click that in the menu everything seems to go just fine and computer goes down. After I start the comp again it just does not resume. s2disk command works fine for me also the suspend to ram works.

I have kde4.2 and arch linux

Do you have any other suspend systems installed on your system? Also, please define "does not resume" ( ie. Turns on then off quickly, comes back at black screen, etc )