Mario: Your fix works beautifully on my Thinkpad T61p with an nVidia Quadro FX 570M video card running Hardy 64-bit. I've suspended and resumed six times so far without ever getting the white screen, and haven't noticed any problems with compiz. I hope this will make it into Hardy soon.
For anyone else who wants to try Mario's fix, here's how I did it: Go to System --> Administration --> Software Sources and select the Third-Party Software tab. Click on Add and enter the following line:
deb http://ppa.launchpad.net/superm1/ubuntu hardy main
Then click on Add again and enter the following line:
deb-src http://ppa.launchpad.net/superm1/ubuntu hardy main
Click on Close, then on Reload. Shortly your software updater will indicate that there are updates available for compiz. Install them, restart your machine, and voila!