Hi, I've got the same probs.
I have an i-Mate K-Jam with AKU2.
When I set the backlight timeout on battery to 1min, and put it in standby, it constantly reverts to 10 seconds. :evil:
Ever tried that? It sucks.
Also tried the registrykey mentioned above, but that does not work.
When I set the timeout via the GUI, I can see the change in the registry, so far so good.
But when the KJam goes in standby, it reverts back to 10secs.
The only way it does work is to disable the timeout completely
The backlight won't go out that way, but is draining your battery.
Especially when listening to MP3's and don't need any backlight.
PS: I don't want to do a hard-reset (yet), I want to wait until aku2.2, then I have to install the KJam again anyhow.