Re: Problems with GeForce FX Go5200, Xorg, and DPMS
The DPMS power saving display-resume issue is a known bug.
I'm not aware of any bugs where DPMS cannot be disabled (and I've successfully done so with 1.0-9631 & 1.0-9746 on several occasions). This sounds more like an X server problem. You should be able to disable DPMS using the xset command. Specifically how are you trying to disable DPMS?