(In reply to comment #1)
> That sounds more or less like the problem I fixed with
> http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/
> ?id=c4ae0e2cbcc0e2ebf9f13ee92d59b5120254a1dc .

Just checking after reading the commit message, the working mouse pointer does
not contradict that this is a DPMS problem, right?

> Can you try that?

Sure. Though I have no idea how to reproduce the bug.