“Previous/bizarre laptops” sought to assist take a look at Linux kernel backlight drivers

If you've got a laptop that's sufficiently old, like this 2014 pile-up at a recycling program, or a bit "weird," you can help test it against proposed changes to the Linux kernel's backlight systems.

Enlarge / For those who’ve acquired a laptop computer that is old enough, like this 2014 pile-up at a recycling program, or a bit “bizarre,” you possibly can assist take a look at it in opposition to proposed modifications to the Linux kernel’s backlight methods.

Do you might have a laptop computer that is both “fairly previous” or “bizarre in another approach”? Did it ship with out Home windows from the manufacturing unit, or did you flash its firmware with coreboot? You could possibly assist the Linux kernel transfer its backlight code ahead with out abandoning quirky gear like yours.

Hans de Goede, a longtime Linux developer and principal engineer at Pink Hat, writes on his Livejournal about the necessity to take a look at “a particular group of laptops” to stop their backlight controls from disappearing in Linux kernel 6.1.

Previous laptop computer exams are wanted as a result of de Goede is initiating some main modifications to user-space backlight controls, one thing he has been engaged on since 2014. As detailed at Linux weblog Phoronix, there are a number of points with how Linux tries to deal with the big variety of backlight schemes in shows, which de Goede laid out on the latest Linux Plumbers Convention. There may be a number of backlight gadgets working a single show, leaving high-level controls to “guess which one will work.” Brightness management requires root permissions in the meanwhile. And “0” handed alongside as a backlight worth stays a conundrum, because the engineer identified in 2014: Is that fully off, or as little as the show may be lit?

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