[coreboot] Intel GMA: Backlight brightness driver

Patrick Rudolph siro at das-labor.org
Sun Jul 29 11:26:32 CEST 2018

Dear coreboot users,
The following commit adds Mailbox 3 support for improved panel back-
light brigthness control on Intel GMA platforms.

It fixes the problem with 100% brightness on S3 resume.

Please test and review https://review.coreboot.org/#/c/coreboot/+/27711


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