Re: [PATCH] acpi: blacklist win8 OSI for ASUS Zenbok Prime UX31A

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

On 07/17/2013 11:42 PM, Felipe Contreras wrote:
> On Wed, Jun 26, 2013 at 9:37 PM, Aaron Lu <aaron.lu@intel.com> wrote:
> 
>> Please reference a similar bug where ACPI video driver can't work for
>> some thinkpad win8 laptops:
>> https://bugzilla.kernel.org/show_bug.cgi?id=51231
>>
>> And the proposed way to fix this issue is for all Win8 systems, the
>> ACPI video backlight interface will be removed, leaving only GPU's
>> backlight interface:
>> https://lkml.org/lkml/2013/6/9/161
> 
> Thanks. I took a look at the thread and the patches, so essentially
> when those patches are applied, I should expect the same behavior as
> acpi_backlight=vendor, right? If so, that doesn't work correctly in
> this laptop. In this laptop intel backlight works through X, but when
> I set the level to 0 everything is black (it works fine in ACPI), and

That sounds a bug in i915's handling of backlight to me, perhaps file a
bug for that? For component, please choose Drivers/DRI-intel.

> the keyboard keys don't work.

I don't see why the backlight hotkey stops working, we have kept ACPI's
event notification handling for Win8 systems. Worth filing a bug too :-)
For components, please choose ACPI/Video.

BTW, what's the situation after you try the following 3 patches:
https://patchwork.kernel.org/patch/2829342/
https://patchwork.kernel.org/patch/2829344/
https://patchwork.kernel.org/patch/2829339/

Thanks,
Aaron