Re: Raon Everun (Microchip multifunction HID)

On Fri, 19 Oct 2007, Bill Gribble wrote:

> Alan Stern <[email protected]> writes:
> > Hmmm.  There is one clear difference between the Windows log and the
> > Linux log for interface 0: Windows sends three Set-Report messages in
> > URBs 9, 10, and 11 (all identical, so I don't know why there are three
> > of them).  It's not easy to tell what the reports are for, beyond the
> > fact that they are outputs.  Maybe they control LEDs on the keboard.  
> > Or maybe they enable the keyboard somehow...
> 
> There are no LEDs but there is a keyboard backlight... possibly
> related.  Am I reading the sniffer log correctly, that the message
> body in each of these 3 URBs consists of a single 00 byte?

That's right.  If it controls something like the backlight then maybe 
only the low-order bit matters.

> Interesting that the timestamp for URB 11 is 10 seconds later than the
> first two..

It's hard to tell what that means.  In principle you could figure it
out from the report descriptor, but it would be a nuisance.

> > Another thing you can try is to unbind the usbhid driver from all the 
> > interfaces except 0, and then reset the device.  Maybe somehow one of 
> > the other interfaces is messing up the keyboard.
> 
> What do you mean by "reset" in this case? 

Use the usbreset program I told you about earlier.

Alan Stern


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