Its whatever, co-op barely works via netplay, and we got a internet issue on one end and a PC strength issue on the other when remote playing . :P
We settle suffering through via old fashion asynchronous playing + steaming it to each other.
Was asking about the issue to both let you know and maybe find out if there is some backend dependency that windows specific on Dolphin but somehow not on the Linux version? I wouldn't know otherwise what causes the problem.