Re: Authentication prompt when changing brightness

[Vagrant Cascadian]

On 2019-10-07, David Wilson wrote:
> Should I be able to use "brightnessctl" without sudo if I'm in the
> "video" group?  Looks like I'm not able to:
>
> ---
> λ brightnessctl set 200
> Can't modify brightness: Permission denied
>
> You should run this program with root privileges.
> Alternatively, get write permissions for device files.

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)))))

Which I pretty much took straight from the udev rule for android devices
in the manual:

  https://guix.gnu.org/manual/en/html_node/Base-Services.html


live well,
  vagrant

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