[SRU][PRECISE & QUANTAL][PATCH] d627b62 i915: initialize CADL in opregion

[AceLan Kao]

BugLink: https://bugs.launchpad.net/bugs/806032

d627b62 i915: initialize CADL in opregion

Some BIOS will read the CADL field to check the current active display device.
Without this patch, this field will be empty and then we can't control
the brightness.
This issue affects Clevo and ASUS laptops.

Best regards,
AceLan Kao.

--
Chia-Lin Kao(AceLan)
http://blog.acelan.idv.tw/
E-Mail: acelan.kaoATcanonical.com (s/AT/@/)