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I did a few tests to connect the Max 2 in different ways as a second monitor with Linux. In all tests the tablet was networked via USB
1) The app XSDL X - which runs an X server in android works pretty well but is slow, as that flavor of X server doesn't seem to apply any hardware acceleration. Forwarded apps from the desktop system dependent on any kind of 3D acceleration are a no go too. Performance isn't great either.
2) Monitor Mod 3: Works just as expected and is easiest to set up. I observed the CPU cores with htop while it's running and noticed a constant high CPU load (screen modes, settings etc. didn't matter) even when the picture is still. That's probably where the reported high battery drain comes from. At least the load doesn't go up when the picture is actually moving.The load average (for people who know what that means) goes above 2, touching 3.
4) bVNC in combination with tigerVNC server on the host - this one worked the best. When the screen is static, there's no CPU load. When there's little movement on the screen, the load is still low. frequent and constant updates can cause a higher CPU load than the monitor mod, though. With VirtualGL and a running X server on the host, apps using 3D acceleration are possible too, or just use x11vnc. Stuff like Dwarf Fortress is playable, stuff like Rimworld isn't really. (full screen scrolls are brutal and work much better via HDMI)
All in all, a remote VNC connection seems to be the most efficient and advisable.
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