rEFInd breaks standby mode on MacBook Air 5.2

I'm rEFInd's developer. I've heard another report similar to this, but I'm unable to replicate it myself, since my one Intel-based Mac is an elderly 32-bit model that doesn't exhibit this behavior. Since the problem doesn't manifest within rEFInd itself, I can't simply create a debugging version to give to somebody like you who does have the problem; it's going to take hands-on fiddling with the hardware to identify the cause of the problem and find a solution. The solution could be something like an alternative installation method for rEFInd or a code change to rEFInd, but whatever it is, I'm afraid that I can't find it unless/until I get a computer that has the problem. I have no plans to buy any new Macs in the near future, so this will have to wait indefinitely or for somebody else to find a solution.

I tried the old rEFIt (instead of the forked project rEFInd), it works beautifully with Macbook Air 5.2 and Ubuntu 13.04, and the wake from sleep problem is gone.

So I highly recommend people having this problem give rEFIt a try.