I finally got my HVR 1600 grey top remote to work on MythBuntu 10.04 x64 as per this thread:
http://ubuntuforums.org/showthread.php?t=1043882&page=4

But only a few buttons work! arrows, enter, numbers volume and mute buttons work.

Anyone knows how I could configure these? I'd realy like to have the back or escape button to work!

Thanks,