Screen goes blank with Vista + ATI Radeon - microsoft.public.windows.vista.hardware_devices | Google Groups
There's a discussion in this newsgroup about the issue I'm having with Toshiba A215 and Vista Ultimate. Will try the power setting and see how it goes.
I believe the laptop freezes (with blank screen) only if I put it to sleep/hibernate and wake up later. If I perform shutdown and a new boot it behaves properly.