From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Subject: Re: Authentication prompt when changing brightness
Date: Mon, 14 Oct 2019 12:55:12 -0400
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In-Reply-To: <c686dca7-4423-485d-9917-fd7247994ebc@www.fastmail.com> (David
 Wilson's message of "Tue, 08 Oct 2019 15:52:55 -0700")
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To: David Wilson <david@daviwil.com>
Cc: Vagrant Cascadian <vagrant@debian.org>, help-guix@gnu.org, Jesse Gibbons <jgibbons2357@gmail.com>

"David Wilson" <david@daviwil.com> writes:

> On Mon, Oct 7, 2019, at 5:18 PM, Vagrant Cascadian wrote:
>> 
>> You have to configure the udev rule in your system configuration; using
>> the rules shipped with the brightnessctl package works:
>> 
>>   (udev-configuration (inherit config)
>> 					(rules (cons brightnessctl
>> 								 (udev-configuration-rules config)))))
>> 
>
> Thank you Vagrant, that led me down the correct path!  I was able to
> use your suggestion plus a udev config snippet I found in Pierre
> Neidhardt's Guix config to get backlight controls to work:
>
> https://gitlab.com/ambrevar/dotfiles/blob/master/.config/guix/system/default.scm#L22-30
>
> Regarding xfce4-power-manager's inability to control the backlight, I
> believe that its polkit policy file has not been picked up by the
> polkit-service such that it doesn't end up in /etc/polkit-1/actions
> where it belongs.  I'm looking into submitting a patch to correct this
> behavior so that future Guixers aren't confounded by that issue as I
> was.
>
> Thanks!
>
> David

Thanks for looking into it, David!

Maxim