On Mon, 30 Sep 2002, Thomas Winischhofer wrote:
>
> The goal is: A quick hack in order to do a simple task which I am asked
> for almost every day:
>
> The hardware I am developing for has two CRT controllers (actually it's
> the sis driver for XFree86). One of these CRT controllers is able to
> control LCD panels and TV encoders, but only one of these two at the
> same time. The choice between LCD and TV (if both are detected at server
> start-up) is currently done with an Option in XF86Config-4, but this
> makes it impossible to change the setting during run-time (which is what
> users really ask for). (The special key on laptops which should provide
> this does not work under Linux - don't ask why; even if it did it is not
> satisfactory as I have no control over what the BIOS does to my
> registers. However, involving the BIOS is definitely not desired.)
Those key presses often never get passed the BIOS. They
won't even get to the X-server. That's the way they work on the
recent laptops that I've had experience with. No software outside
of the BIOS knows about it.
>
> So, I thought of another q&d solution: In the good, old
> CTRL-ALT-KP_Plus/Minus-manner why not intercept eg. CTRL-ALT-KP_Multiply
> and cycle through all possible output devices (LCD, TV and -
> theoretically - secondary VGA, that is)?
>
> Can this be done from within a video driver? I looked though the input
> related code but could not find a solution.
>
I suspect that it's not possible for the video driver to intercept
key presses.
Mark.
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