From mboxrd@z Thu Jan  1 00:00:00 1970
From: "David Wilson" <david@daviwil.com>
Subject: Re: Authentication prompt when changing brightness
Date: Tue, 08 Oct 2019 15:52:55 -0700
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To: Vagrant Cascadian <vagrant@debian.org>, Jesse Gibbons <jgibbons2357@gmail.com>, help-guix@gnu.org


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