I finaly have a linux version of Arma 3 running.
First issue was with Radeon 5770. The r600 open source mesa driver only exposes opengl 3.3, while game requires opengl 4.1. OpenGL 4.1 for r600 might come later, I "worked around" by buying a more recent graphics card (R390). With open source radeonsi driver (mesa-11.0.0-rc2) the game atleast runs. I haven't really had time to play the game yet, so I don't have much to say about performance or issues when using open source GL driver at this time. When using graphics menus autodetect settings gives detectedAdapterBenchmark=121 on linux vs. 160 on windows.
I did initial download with steamcmd to steam library on NFS network drive, where local user has group r/w/x permissions. This made the game exit silently on startup. Resolution was to copy it to local steam library after getting and installing a bigger SSD. Propably a permission issue, but it would be nice to give an proper error message instead leaving the user guessing for reason. Looks like ownership of game files is required, but it may be an another issue too.
Would it be possible to add linux and mac to issue trackers (http://feedback.arma3.com) platform or os pull down menu? This would make searching for known issues a lot easier.
Despite these few minor issues I'm very happy with this port, looking forward to actually playing with it.
