lenovo/x60: Enable brightness controls (native graphics)
On i945 legacy brightness control is enabled by a single
bit in BLC_PWM_CTL. It's bit 16 or bit 0 (the other one
reverses polarity). Set the bit to enable brightness
controls.
Change-Id: Id855c4e91fe71fb489739e62fbe99ca22841acd2
Signed-off-by: Francis Rowe <info@gluglug.org.uk>
Reviewed-on: http://review.coreboot.org/7048
Reviewed-by: Martin Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>