Re: Backlight control on Lombard PB

On Thu, 10 Aug 2000, Michael Schmitz wrote:

quoted

quoted

Should be fixed in BenH's current tree, he said he was going to do it this
past weekend. The pmu backlight controller didn't get registered on the
Lombard (and possibly Wallstreet) because the backlight-control property
is missing on these machines.

Well, the backlight control surely doesn't work on Pismos... I just hate

I was speaking about Lombard and related machines. On the Pismo, the
backlight control is in the display driver IIRC.

And with the fix to pmac_setup.c it is indeed working on the Lombard,
thanks to everyone!

BenH did some research on the settings of the function keys, but that's
probably not exactly the problem with the Pismo...(?):

I've done some hacking on MacOS today and found that the Fn key behaviour
can apparently be triggered by setting an ADB register of the keyboard.

If you write 0xc6 0x01 to register 1 of the keyboard, the Fx keys will be
real function keys by default and Fn will trigger the control buttons.
Write 0xc6 00 to revert the behaviour to default.

So a userland tool can be easily hacked using the trackpad tool source as
an example, you have to find the keyboard instead of the trackpad (device
with default and current address 2 should always work on PowerBook and
iBook ADB) and then do the register write of a 2 bytes message
(0xc6 0x01). I can't try this now, but if someone wants to look at it...

I tried to make some sense of this, but unfortunately I wasn't able to tell
from trackpad.c where I'd try to find the keyboard and where exactly the
register write is done (one of the 'send(buf, n)', probably? Then
  buf[0] = 0xc6;
  buf[1] = 0x01;
  send(buf, 2);
would be the thing to do?). No experience with this, but maybe I'll get it
yet sorted out...
Would this work for setting the register:

void set_fnkey(int id, int mode)
{
	unsigned char buf[16];

	set_program_mode(id, 1);

#ifdef DEBUG
	printf("setting mode: %d\n", mode);
#endif

	buf[0] = 0xc6;
	buf[1] = (mode < 1) ? 00 : 0x01;
	send(buf, 2);
	listen(buf);

	set_program_mode(id, 0);

}

if called with (2, 1) to set the F keys to function keys, and with (2, 0)
to set it back to default? I'm afraid I've not fully grasped what
set_program_mode(id, n) does.


Cheers,
							Derek


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