I am dual-booting MacBook Air 5.2 and Ubuntu 13.04 using rEFInd, so far things appears to work except when Macbook Air goes from sleep mode into standby mode (dump system state from RAM to SSD), it will not recover when I open the lid or click on touchpad.

Specifically, I can see keyboard light on but no output on screen at all, so it's impossible for me to tell if it has booted into the login screen or not. The only solution appear to force shutdown MBA at this point by holding power button

some info on MBA standby mode