Backlight control on Lombard PB

Backlight control on Lombard PB

[Derek Homeier]

Hi all,

I saw a couple of posts from people who seem to have the recent kernels
(2.2.17pre1[3-5]-ben1) running on a 1999 Powerbook.
Unfortunately, I have still the same problems with the backlight control
that first appeared with 2.2.17pre10-ben1, i.e.

 1. {Fn-,}F[12] don't adjust brightness
 2. After wakeup from sleep, the backlight remains dark

At least it does not seem to crash anymore when I try to repeatedly wake
it up, but the only thing I can do at that point is to reboot.
Has anyone one of these kernels working on a Lombard and is actually able
to use sleep (or adjust monitor brightness)?

Besides, the keycodes 10 and 50 (less/greater and asciicircum/degree) on
the german keyboard seem to have been swapped in pre13-pre15.

Thanks for any feedback,
							Derek


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Re: Backlight control on Lombard PB

[Olaf Hering]

On Tue, Aug 08, Derek Homeier wrote:


> Besides, the keycodes 10 and 50 (less/greater and asciicircum/degree) on
> the german keyboard seem to have been swapped in pre13-pre15.

The current tree should have that problem fixed, proably the backlight
too. Can you rsync the current tree and try it?
rsync it in a vanilla 2.2.16 or use the binary at
ftp://ftp.suse.com/pub/suse/ppc/update/BETA/devel somewhere and rsync in
that tree. Just to reduce traffic.


Gruss Olaf

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Re: Backlight control on Lombard PB

[Michael Schmitz]

> I saw a couple of posts from people who seem to have the recent kernels
> (2.2.17pre1[3-5]-ben1) running on a 1999 Powerbook.
> Unfortunately, I have still the same problems with the backlight control
> that first appeared with 2.2.17pre10-ben1, i.e.
>
>  1. {Fn-,}F[12] don't adjust brightness
>  2. After wakeup from sleep, the backlight remains dark

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.

	Michael


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Re: Backlight control on Lombard PB

[Derek Homeier]

On Wed, 9 Aug 2000, Michael Schmitz wrote:

> > I saw a couple of posts from people who seem to have the recent kernels
> > (2.2.17pre1[3-5]-ben1) running on a 1999 Powerbook.
> > Unfortunately, I have still the same problems with the backlight control
> > that first appeared with 2.2.17pre10-ben1, i.e.
> >
> >  1. {Fn-,}F[12] don't adjust brightness
> >  2. After wakeup from sleep, the backlight remains dark
>
> 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.
>
So we were just lucky that it used to work before?

It should be in the linux-pmac-benh branch then, yeah? I rsynced again
from linuxcare.com.au yesterday (or rather 2:00 UT this morning), and the
problem still remains. Is there anything else to do, upgrade to a newer
BootX perhaps, or whatever?

Thanks,
							Derek


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Re: Backlight control on Lombard PB

[Michael Schmitz]

> > 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.
> >
> So we were just lucky that it used to work before?

Nope, it broke because BenH added code to have either the PMU driver or
the atyfb driver register a backlight control callback (depending on where
the power control logic actually resides).

> It should be in the linux-pmac-benh branch then, yeah? I rsynced again
> from linuxcare.com.au yesterday (or rather 2:00 UT this morning), and the
> problem still remains. Is there anything else to do, upgrade to a newer
> BootX perhaps, or whatever?

Compile you own kernel, and add a || machine_is_compatible("PowerBook1,1")
right after the || machine_is_compatible("AAPL,PowerBook1999") in
arch/ppc/kernel/pmac_support.c:register_backlight_controller(). That fixed
it for me. I'll resync and see what BenH did there later today.

	Michael


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Re: Backlight control on Lombard PB

[Derek Homeier]

On Wed, 9 Aug 2000, Michael Schmitz wrote:

> > It should be in the linux-pmac-benh branch then, yeah? I rsynced again
> > from linuxcare.com.au yesterday (or rather 2:00 UT this morning), and the
> > problem still remains. Is there anything else to do, upgrade to a newer
> > BootX perhaps, or whatever?
>
> Compile you own kernel, and add a || machine_is_compatible("PowerBook1,1")
> right after the || machine_is_compatible("AAPL,PowerBook1999") in
> arch/ppc/kernel/pmac_support.c:register_backlight_controller(). That fixed
> it for me. I'll resync and see what BenH did there later today.
>
Hmm, there is a  || machine_is_compatible("AAPL,PowerBook1,1")
in it. I'll check the file I rsynced at home later.

							Derek


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Re: Backlight control on Lombard PB

[Michael Schmitz]

> Hmm, there is a  || machine_is_compatible("AAPL,PowerBook1,1")
> in it. I'll check the file I rsynced at home later.

That won't work, I tried that :-)

	Michael


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Re: Backlight control on Lombard PB

[Benjamin Herrenschmidt]

>
>> Hmm, there is a  || machine_is_compatible("AAPL,PowerBook1,1")
>> in it. I'll check the file I rsynced at home later.
>
>That won't work, I tried that :-)

My fault, I made a typo there... remove the "AAPL," part.

Ben.

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Re: Backlight control on Lombard PB

[Topi Kanerva]

On Wed, 9 Aug 2000, Michael Schmitz wrote:

>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
it when I have to boot over to MacOS to switch up the backlight level
(I usually keep it low because it eats so much battery...)
Now, I realize that the PMU on Pismos is somewhat different, but supposedly
there is a way (in MacOS) to try to poke what kind of values are being
written to the registers when you change the backlight in MacOS (fn-F1/F2)

actually, to be able to turn off the backlight is perharps the most
important single power-saving feature. unfortunately, I myself don't have
any reverse-engineering experience on MacOS (this is my first mac ever...)


-topi


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Re: Backlight control on Lombard PB

[Benjamin Herrenschmidt]

>Well, the backlight control surely doesn't work on Pismos... I just hate
>it when I have to boot over to MacOS to switch up the backlight level
>(I usually keep it low because it eats so much battery...)
>Now, I realize that the PMU on Pismos is somewhat different, but supposedly
>there is a way (in MacOS) to try to poke what kind of values are being
>written to the registers when you change the backlight in MacOS (fn-F1/F2)
>
>actually, to be able to turn off the backlight is perharps the most
>important single power-saving feature. unfortunately, I myself don't have
>any reverse-engineering experience on MacOS (this is my first mac ever...)

Backlight control should work on Pismo with my latest kernels. It's not
driven by te PMU on those machines, it's directly controlled by the ATI
chip. I finally found some time to push the Lombard fix yesterday.

Ben.


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Re: Backlight control on Lombard PB

[Michael Schmitz]

> >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.

	Michael


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Re: Backlight control on Lombard PB

[Derek Homeier]

On Thu, 10 Aug 2000, Michael Schmitz wrote:

> > >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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Re: Backlight control on Lombard PB

[Derek Homeier]

On Tue, 8 Aug 2000, Benjamin Herrenschmidt wrote:
> >
> >I saw a couple of posts from people who seem to have the recent kernels
> >(2.2.17pre1[3-5]-ben1) running on a 1999 Powerbook.
> >Unfortunately, I have still the same problems with the backlight control
> >that first appeared with 2.2.17pre10-ben1, i.e.
> >
> > 1. {Fn-,}F[12] don't adjust brightness
> > 2. After wakeup from sleep, the backlight remains dark
>
> I fixed this recently. I didn't yet post a new precompiled kernel, but I
> will do soon.
> >
I rsync'd last night, but I'll try again this evening.

> >At least it does not seem to crash anymore when I try to repeatedly wake
> >it up, but the only thing I can do at that point is to reboot.
> >Has anyone one of these kernels working on a Lombard and is actually able
> >to use sleep (or adjust monitor brightness)?
> >
> >Besides, the keycodes 10 and 50 (less/greater and asciicircum/degree) on
> >the german keyboard seem to have been swapped in pre13-pre15.
>
> Actually, I think it's more that they are now correct (they used to be
> wrong) ;) You should probably update your keymaps.
>
Must have been wrong for quite a while, but I vaguely recall some problems
with those keys when I first installed Linux (think ^/deg was giving <>
then, and <> did nothing at all, or vice versa).

Thanks,
							Derek


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Re: Backlight control on Lombard PB

[Olaf Hering]

On Tue, Aug 08, Derek Homeier wrote:

> > >Besides, the keycodes 10 and 50 (less/greater and asciicircum/degree) on
> > >the german keyboard seem to have been swapped in pre13-pre15.
> >
> > Actually, I think it's more that they are now correct (they used to be
> > wrong) ;) You should probably update your keymaps.
> >
> Must have been wrong for quite a while, but I vaguely recall some problems
> with those keys when I first installed Linux (think ^/deg was giving <>
> then, and <> did nothing at all, or vice versa).

Please check it first:

^° should be 50 at console and 58 in X
<> should be 10 at console and 18 in X

Use xev and showkeys to display the values.


Gruss Olaf

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