Mackbook pro nvidia based video backlight

[Rui Paulo]

On 30 Jan 2009, at 07:52, Alexander Leidinger wrote:

> Quoting Ed Schouten <ed at 80386.nl> (from Thu, 29 Jan 2009 15:36:06  
> +0100):
>
>> * Alexander Leidinger <Alexander at Leidinger.net> wrote:
>>> So you want that either
>>> - a daemon running as root is written which listens to user
>>>   requests to set the backlight via sysctl
>>> or
>>> - a SUID root program is written that sets the backlight
>>>   via sysctl
>>> instead of
>>> - a character device with appropriate filesystem permissions
>>>   which allows to not go the SUID root or daemon running as
>>>   root way
>>> ?
>>
>> Yes. The primary reason is that it is more consistent with the rest  
>> of
>> the operating system. powerd also uses sysctl's instead of a  
>> character
>> device, for example.
>
> Powerd does not interact with the user, it is doing automatic power  
> management. A backlight on the other hand needs to be adjustable by  
> the user.
>
> Normally I would expect some keys on the keyboard to handle this, so  
> there should be no need to have some userland stuff, but as I don't  
> know about how Apple is doing this, I assume there's some valid  
> reason to handle it from userland. But then there needs to be some  
> easy way to let an user handle it, even if you are on the console. A  
> separate daemon or a SUID root program to control the backlight  
> sounds like overkill to me.

Well, easy: only let the operator group change the sysctl and add your  
appropriate user accounts to the operator group. No daemon is needed.  
This is what I thought about when doing the Intel backlight driver,  
but I never actually did it.

Regards,
--
Rui Paulo

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