Date: Sat, 31 Jan 2009 16:31:37 +0000 From: Rui Paulo <rpaulo@freebsd.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: Ed Schouten <ed@80386.nl>, Daniel Lannstrom <op@trekdanne.se>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Mackbook pro nvidia based video backlight Message-ID: <508FD1E6-8281-4C9E-A495-AE435447C636@freebsd.org> In-Reply-To: <20090130085227.957230z897u8viww@webmail.leidinger.net> References: <20090127124137.46fcfac5@baby-jane.lamaiziere.net> <20090127150040.GA4333@haruhi> <20090128134309.GN17198@hoeg.nl> <20090129151021.14131so3ozumpfj4@webmail.leidinger.net> <20090129143606.GC17198@hoeg.nl> <20090130085227.957230z897u8viww@webmail.leidinger.net>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --Apple-Mail-3--438256651 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit On 30 Jan 2009, at 07:52, Alexander Leidinger wrote: > Quoting Ed Schouten <ed@80386.nl> (from Thu, 29 Jan 2009 15:36:06 > +0100): > >> * Alexander Leidinger <Alexander@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 --Apple-Mail-3--438256651 content-type: application/pgp-signature; x-mac-type=70674453; name=PGP.sig content-description: This is a digitally signed message part content-disposition: inline; filename=PGP.sig content-transfer-encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Darwin) iEUEARECAAYFAkmEfOkACgkQfD8M/ASTygJ9xQCVFEaOpr7Oj1sC8kuvRyH2Hwqu rgCcCVy3U2WaQWg/8MCYaVV8BJookbE= =VKiZ -----END PGP SIGNATURE----- --Apple-Mail-3--438256651--
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