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Much like for rfkill devices we should provide some stability regarding
enumeration order, hence include the stable bits of the device path in
the file name we store settings under.
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backlights if we have both for the same device
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Piggy-backing on the display backlight code, this saves and restores
keyboard backlights on supported devices.
The detection code matches that of UPower:
http://cgit.freedesktop.org/upower/tree/src/up-kbd-backlight.c#n173
https://bugs.freedesktop.org/show_bug.cgi?id=70367
[tomegun: also work for devices named "{smc,samsung,asus}::kbd_backlight"]
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Let's not scatter (private) files in /var around, let's place them all
in /var/lib/systemd and below.
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This makes the description string of the backlight service a bit nicer.
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As many laptops don't save/restore screen brightness across reboots,
let's do this in systemd with a minimal tool, that restores the
brightness as early as possible, and saves it as late as possible. This
will cover consoles and graphical logins, but graphical desktops should
do their own per-user stuff probably.
This only touches firmware brightness controls for now.
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