"If Rhythmbox Music Player does not detect your device as a portable audio player, you can create an empty file named .is_audio_player at the top level hierarchy of the filesystem of your player."
I have an undetected older iPod Touch. I tried all ptp, mtp, gphoto2 following:
None of these manage to touch or write the file .is_audio_player to the device.
Any ideas? Appreciate, Thomas