I have a dual screen desktop running Arch and I play games a lot, on the radeonSI Gallium driver and Intel driver.
The funny thing with multi-screen gaming on Linux is that the "default" target SDL picks is not your primary monitor, it is the monitor on the left. It doesn't matter what input order its in, or anything else, I can reconfigure my screens however I want but "full screen" always means leftmost panel.
The funny thing with multi-screen gaming on Linux is that the "default" target SDL picks is not your primary monitor, it is the monitor on the left. It doesn't matter what input order its in, or anything else, I can reconfigure my screens however I want but "full screen" always means leftmost panel.