Macbook Air not waking up from Suspend/Sleep with rEFInd boot manager installed Having installed both rEFInd 0.6.10 (updated to 0.6.11) via its install.sh and Ubuntu 13.04 on another partition I can now choose on a MacBook Air to boot either MacOS or Linux.

When running MacOS and closing and soon re-opening the lid, everything is fine, but after a longer time of closed lid, the machine is not waking/starting up. Instead I have to long-press the power button and then press it again to boot the machine.
I had the same exact issue with my MacBook Pro and I have rEFInd installed as well. I resolved the problem disabling the autopoweroff option with pmset. See this answer.