[laptop-mode] usbhid autosuspend

[list at phuk.ath.cx]

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Alright.
Now this is a patch against 1.50 trunk that adds a USB-ID blacklist. 
It's empty by default, so users will have to realize they have broken 
hardware.

I also updated the config notice to reflect my view of the problem, 
which is pretty much in line with what the kernel devs think. If you're 
not okay with that, feel free to change it as you like.

You might also want to give it another test run on your system. So far I 
did not take proper care to test all possible border- or 
error-conditions. However the worst-case behaviour is limited to 
suspending a device when actually it shouldn't.

Grettings and thanks for your effort.

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