On Fri, 2 Oct 2026, David Wright wrote: > 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. >
found it systemd-backlight@backlight:radeon_bl0.service thanks
