linux-kernel - Re: First kernel patch (optimization)

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Message-ID: <CAKdAkRSCcWALhnODEmXt08nf5rwL-85CoQNHCaMDfTpfVX9_wg@mail.gmail.com>
Date:	Fri, 25 Sep 2015 15:06:51 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Eric Curtin <ericcurtin17@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Valentina Manea <valentina.manea.m@...il.com>,
	Shuah Khan <shuah.kh@...sung.com>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: First kernel patch (optimization)

Hi Erik,

>
> Yeah, I'm still reading this email thread and learned lots from it.
> I'm working on something more meaningful, but it's not going to be
> ground breaking of course, there is a led on my capslock key on a new
> machine I won at work that does not switch off properly after it is
> switched on.

Is it Debian-derivative by any chance? Their capslock setup is wonky
because CapsLock key does no actually set up as a CapsLock but another
modifier. Also is it in X or is it on text console? Because X handles
led state on its own...

> I think it is something to do with the LED_CAPSL variable
> in here:
>
> drivers/hid/usbhid/usbkbd.c

I do not think you are using usbkbd driver - it is for keyboards in
"boot protocol" and barely anyone users them in such mode. You need to
look into drivers/hid/hid-input.c.

Thanks.

-- 
Dmitry
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