Re: swap ctrl<->caps lock problem

[Gabriel Paubert <paubert@iram.es>]

On Sun, Aug 31, 2003 at 08:04:12PM +0200, Guido Guenther wrote:
> Hi,
> while trying to map caps lock as ctrl on my 12" powerbook I noticed that
> the keypress and release events don't seem to work as expected. While
> e.g. alt generates the "KeyPress-Event" when pushing down the key and
> the KeyRelease-Event when letting it go "caps lock" seems to generate
> the events differently:
>  - it generates KeyPress+KeyRelease when pushing down the key and the LED was off
>  - it generates KeyPress+KeyRelease when releasing the key and the LED was on
> Using showkey on the console confirms this behaviour. This seems to
> caused by
>                 /*
>                  * adb kludge!! Imitate pc caps lock behaviour by
>                  * generating an up/down event for each time caps
>                  * is pressed/released. Also, makes sure that the
>                  * LED are handled.  atong@uiuc.edu
>                  */
>                  case 0x39:
>                         handle_scancode(0x39, 1);
>                         handle_scancode(0x39, 0);
>                         tasklet_schedule(&keyboard_tasklet);
>                         return;
> in mac_keyb.c. What exactly is the reason for not generating a keyup on
> release and keydown on press?

Brokenness of ADB keyboards. The keyboard driver only reports events when
the keyboard reports that a key has been pressed or released. But the
ADB keyboard itslef keeps the state of the the key and reports one 
one half the key events (key-down, nothing on key-up, nothing on
key-down, key-up).

Forget about using Caps-Lock as Control, unless Segher finally 
finds a way to modify the PMU99 code to remove this oddity.
(It has to be optional to work with MacOS).

	Regards,
	Gabriel