I just tried to resume FrodoSatRadio from hibernation while embedded in CF1.5 and could not make it work. After resuming when switching to XM everything locked up to the point that I needed to reboot.
I should note that when I had XM running prior to hibernating the sound quality was unacceptably flat. XMPCR is known for bad sound quality and because it has to use line-in to avoid conflicting with the wav being used by CF, there is no way to improve the sound. I hope whoever winds up designing the XM plug figures out a way to utilize wav so we can improve the sound quality.