ACPI video: ignore BIOS backlight value for HP dm4
On a HP Pavilion dm4 laptop the BIOS sets minimum backlight on boot, completely dimming the screen. Ignore this initial value for this machine. Signed-off-by: NGustavo Maciel Dias Vieira <gustavo@sagui.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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