For Mednafen psx rumble is working correctly for maybe minute, then it stops rumbling. Sometimes the rumble will reintroduce again for a short time. Don’t know if this is Linux related, I don’t have Windows to test it on.
I’ve found other user with the same problem here. My distro is Ubuntu 14.04 64 with the latest updates, udev driver for joypad. I have Genius BLAZE joypad (I think it has xbox mapping). For n64 emulator rumble works correctly all the time.
Thanks.