I'm at Chaos Computer Congress, and Qubes has a table.  I got some help from 
them with the multimedia buttons for i3.  Specifically, I configured the 
brightness and sound controls, but not the multimedia player controls because 
the player is not in Dom0 (where the i3 exec runs)

To get this working in dom0 install some software:

sudo qubes-dom0-update pulseaudio-utils
sudo qubes-dom0-update xbacklight

Then add the following lines to .config/i3

# Pulse Audio controls
bindsym XF86AudioRaiseVolume exec --no-startup-id pactl set-sink-volume 1 +5% 
#increase sound volume
bindsym XF86AudioLowerVolume exec --no-startup-id pactl set-sink-volume 1 -5% 
#decrease sound volume
bindsym XF86AudioMute exec --no-startup-id pactl set-sink-mute 1 toggle # mute 
sound

# Sreen brightness controls
bindsym XF86MonBrightnessUp   exec xbacklight -inc 20 # increase screen 
brightness
bindsym XF86MonBrightnessDown exec xbacklight -dec 20 # decrease screen 
brightness


that's it,
Jon


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