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> Where on the filesystem does it store the saved values so you can debug if things do go cactus?

Quoting the page you linked to: "On disk, the backlight brightness is stored in /var/lib/systemd/backlight/."



I missed it. I guess I've gotten spoiled by BSD manual pages that have file locations in a subsection labelled Files instead of stuck in the description. At the same time, it gives a directory location, instead of an actual filename, which lends one to believe that the actual name and location will be subject to change without notice, as well as the contents of the file, format, etc.




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