I'm using an ATI 6650M gpu card on my pc (+/- 80mhash/s and yes I know I'm running at a loss at that hashrate please do NOT comment on that but on my question). If I'm using my pc it's around +/- 80mhash/s, and when I'm not using my pc, the hashrate goes down after 15 mins to about 45-50 mhash/s. I suppose this has to do something with sleeping/idling power settings or something?

Also, mining with cgminer at intensity 3 since it gives me best/most efficiënt hashrate

Any suggestions how I could keep it running @80mhash/s without having to move with my mouse every 15 mins to get it to full speed again?