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
