A/V sync issue with 5.1 PCM

I have a PS3 and a Sony A/V receiver and I'm seriously miffed that the A/V sync feature on the receiver doesn't work when I'm using uncompressed PCM audio. I want to get the most out of Blu-ray and I love the sound of the uncompressed audio but the sync problem really annoys me.

Can anyone suggest something that I can do to get the sync right?