On Dell E5570,

gdbus call --system --dest org.freedesktop.UPower --object-path
/org/freedesktop/UPower/KbdBacklight --method
org.freedesktop.UPower.KbdBacklight.GetBrightness

works well, returns 0, 1, or 2, depending on keyboard backlight level
OFF, DIM, FULL.

But gdbus call --system --dest org.freedesktop.UPower --object-path
/org/freedesktop/UPower/KbdBacklight --method
org.freedesktop.UPower.KbdBacklight.SetBrightness i

switches backlight to full power independently of parameter i. Even
backlight timeout is deactivated: backlight just does not switch off.

This deactivated timeout "setting" made by Ubuntu is persisted. Even if
I reboot into DOS or BIOS setup, backlight just stays on. I have to
setup the timeout vale in BIOS again to activate the timeout function.

Ubuntu 16.04 with unity-settings-daemon version
15.04.1+16.04.20160209-0ubuntu2.

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https://bugs.launchpad.net/bugs/1510344

Title:
  Keyboard Backlight Turns on at boot

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