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

[Aaron Lu <aaron.lu@intel.com>]

On 01/21/2014 08:11 PM, Matthew Garrett wrote:
> On Tue, 2014-01-21 at 13:32 +0800, Aaron Lu wrote:
>> On 01/21/2014 11:17 AM, Matthew Garrett wrote:
>>> We know that Windows 8 graphics drivers don't use the ACPI interface,
>>> and that systems change their behaviour as a result, in some cases with
>>> absolutely no way for the ACPI interface could possibly work. I haven't
>>> seen any cases where that's obviously true for any non-Windows 8
>>
>> Perhaps I'm not clear, I didn't mean non-Windows 8 systems will all favor
>> GPU's interface, I just meant for one specific win7 laptop I could re-use
>> the existing code to make the GPU's interface as the only one left. And to
>> achieve this, the Win8 OSI check in acpi_video_verify_backlight_support
>> has to be gone.
> 
> We could do that, but why do we think that's the correct fix? The plan
> is to remove the native list entirely and do this for all Windows 8

What do you mean by native list, systems that are Win8 based but don't
work with the GPU's backlight interface?
If so, it doesn't seem we have such a native list now and if we don't
make use_native_backlight=1 by default, we couldn't generate such a
list to start with...

BTW, it doesn't seem everyone agrees with this plan. May I ask, Rafael
and Daniel, what's your opinion please? We need to agree with something
to move things forward.