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BugLink: https://bugs.launchpad.net/bugs/1000146 Some h/w that can adjust screen brightness through ACPI functions, but can't turn on/off the backlight power correctly. So, we list those h/w in quirks and try to turn on/off the backlight power through WMI. Signed-off-by: AceLan Kao <acelan.kao@canonical.com> Signed-off-by: Corentin Chary <corentin.chary@gmail.com> Signed-off-by: Matthew Garrett <mjg@redhat.com>