ACPI / video: ignore BIOS initial backlight value for HP m4
authorAlex Hung <alex.hung@canonical.com>
Tue, 28 May 2013 02:05:09 +0000 (02:05 +0000)
committerBen Hutchings <ben@decadent.org.uk>
Wed, 19 Jun 2013 01:16:52 +0000 (02:16 +0100)
commit10254e3d0182b24685f1043183194c7a6d26a2e9
treec2fd3f80302e23487b45c5a42943edba28dbdd5d
parent36466ac6c36c955ec1e4eaf8f4ed6a192f430f9a
ACPI / video: ignore BIOS initial backlight value for HP m4

commit fedbe9bc6fd3e14b1ffbb3dac407777ac4a3650c upstream.

On HP m4 lapops, BIOS reports minimum backlight on boot and
causes backlight to dim completely. This ignores the initial backlight
values and set to max brightness.

References: https://bugs.launchpad.net/bugs/1184501
Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
drivers/acpi/video.c