I try to use busctl to control the brightness of my screen: $ busctl call org.freedesktop.login1 /org/freedesktop/login1/session/auto org.freedesktop.login1.Session SetBrightness "ssu" "backlight" "intel_backlight" 24242 Call failed: Connection timed out It worked once, but at the same reported connection timed out, after that it doesn't work and report the same connection timed out message. After restart the situtation repeats. I tried to build Guix System with elogind 246.10, the issue with busctl is gone and it works fine without timed out message any number of times.