my phone is not being recognized on pc.. im using lumia 520I'm actually running Linux as I type this. I've never tried any file management/sync using Linux, though, since I have Windows PCs I use to manage my Nokia Lumia 920.
You might want to take a look at these threads: http://forums.windowscentral.com/windows-phone-8/228204-wp8-linux.html
http://forums.windowscentral.com/windows-phone-8/212570-linux-music-mp3-transfer-phone.html