CentOS - Aug 2009 - centos 5.3 with dkms-nvidia-x11-drv and gnome power manager sleep

Hi all,

On my ThinkPad T61, I am trying to get gnome power manager's sleep 
function to work properly.  When I bring my machine back up after sleep, 
I end up with just a black screen and nothing responding.. no capslock 
light when I hit capslock for example.  I am running the latest nvidia 
driver from rpmforge (I'm suspecting the nvidia driver isn't playing
nice).

With Ubuntu I had to make a change in 
/usr/share/hal/fdi/information/10freedesktop/20-video-quirk-pm-el5-lenovo.fdi 
to get it to work.  This, unfortunately, didn't help in CentOS.

'echo mem > /sys/power/state' seems to work properly - the machine 
actually comes back up.  Whatever method G-P-M is using is not.

Can I make G-P-M use that command to suspend?  Or any ideas on how to 
make G-P-M's method work?

Thanks,

Ryan