[Intel-gfx] [PATCH v3] ACPI / video: Add systems that should favor native backlight interface

[Aaron Lu]

On 01/20/2014 09:34 PM, Matthew Garrett wrote:
> On Mon, 2014-01-20 at 16:12 +0800, Aaron Lu wrote:
> 
>> 1 remove the win8 OSI check, I've seen win7 laptops that also needs to
>>   have only the GPU interface left and checking win8 doesn't make much
>>   sense now;
> 
> Are we sure that those aren't simply some other bug?

Well, the firmware on that laptop makes use of EC to do backlight
control and the fact that the firmware interface doesn't work while the
GPU's work seems to indicate that the backlight control circuit is not
routed to EC. I think this is the same case as Win8 laptops.