I have a XPS 13 and I had arch on it but it would drain power while sleeping. The laptop would be dead overnight. Tried a lot of things but couldn't fix it. Had to go back to Windows.
I don't have it either, but I have heard of it. It's something to do with the kernel not being set to allow the s2idle power level. I don't know what triggers it, but setting some kernel flag forces it to show that sleep level which will then be used for sleeping.