On Mon, 28 May 2007, Jiri Kosina wrote:
> Hi Alan,
>
> you are right, however there is still a reason I think that this is not
> the case.
>
> What I am seeing is that the keypresses are lost only if I hit a key (and
> thus wake the autosuspended keyboard up) only after a short time it goes
> to suspend. When I leave it autosuspended for 2 or more seconds
> (approximately), it behaves nicely.
>
> Sure, it still could be a HW issue (I have experienced this with two
> random keyboards I used for testing), but I'd guess it would be something
> different than what you describe. What do you think?
I don't know. Perhaps there's some strange interaction with the parent
hub? It would get autosuspended 2 seconds after the keyboard, unless
there was some other unsuspended USB device plugged into it.
You can prevent the parent hub from being autosuspended by doing:
echo on >/sys/bus/usb/devices/D/power/level
where D is the device name of the parent hub. Try various combinations
to see what works.
Alan Stern
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