On Fri 02 Oct 2026 at 21:38:08 (+0000), [email protected] wrote: > i rebooted and old laptop today that's running bookworm > the display came up very dim > /sys/class/backlight/radeon_bl0/brightness was set to 50 > i adjusted it to 225 and it looked ok > this has never happened before > also in /var/log/syslog i see > > systemd[1]: Starting Load/Save Screen Backlight Brightness of > backlight:radeon_bl0... > systemd[1]: Finished Load/Save Screen Backlight Brightness of > backlight:radeon_bl0. > > how can i find the culprit that's doing this
I'd start with: $ systemctl -l list-units -t service --all and search for backlight. Then look at the configuration files, in /usr/lib/systemd/system/ probably. Cheers, David.
