I know many A500 users have had problems with the power switch. I've managed to repair mine with glue but I don't want to continue using it unless I have to.
Spent all night looking for a way of using the volume buttons to wake the A500 but there's really not many options.
This is the only app I've found, it works flawlessly on 4.0.3 Stock and 4.4.2 OmniROM! Though I can't comment on battery life yet, it does run a background process constantly as a solution so it's entirely ideal.
I have tried editing the hard keys within the system but even with the volume keys assigned to 'wake', nothing happens? This was the case on 3 different ROMs. More information detailed here:
I'm wondering if there's something in the A500 setup that ignores hard keys once it's locked.
There is also a standard feature in 4.4.2 to enable 'Wake on button press', however this option doesn't save/work on the 4.4.2 OmniROM.
Does anybody know how to get the hard keys remapped properly?