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Date:   Fri, 12 May 2017 11:47:12 +0200
From:   Pavel Machek <>
To:     Michal Hocko <>
Cc:     Jingoo Han <>,
        Lee Jones <>,,
Subject: Re: setting brightness as privileged operation?

On Fri 2017-05-12 08:20:04, Michal Hocko wrote:
> On Thu 11-05-17 23:07:55, Pavel Machek wrote:
> > On Thu 2017-01-05 10:23:07, Michal Hocko wrote:
> > > Hi,
> > > I have just learned that my Xfce Power Manager cannot manipulate
> > > brightness because I do not have policykit installed on my computer.
> > > There is a reason for that (yeah it depends on systemd which I prefer
> > > not have).
> > > 
> > > While this is clearly a problem of the Xfce applet I am wondering why
> > > setting the brightness has to be a privileged operation at all. Is there
> > > any strong reason for it or just a general policy that we do not give
> > > world writable files into sysfs?
> > 
> > Well, if you have another user logged in using ssh, and changing _your_
> > brightness, that will be somehow annoying, right?
> I am pretty sure that such a user can do much larger harm than playing
> with brigtness of my LCD. Anyway I went with my own rc.local hack.

Can he? Those are bugs to be fixed. We don't want them in kernel...
(cesky, pictures)

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