Re: [PATCH] dell-wmi: Add quirk for Dell Inspiron 3138

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On Wed, Dec 04, 2013 at 04:14:15PM +0800, AceLan Kao wrote:

> It does what you say above.
> But, the variable use_native_backlight is false by default, and user
> has to enable this by adding one kernel parameter
> video.use_native_backlight=1
> I don't see this do any difference with acpi_backlight=vendor as user
> has to add the kernel command line explicitly to get rid of the broken
> acpi_video0.

Right. The default needs to be changed.

> We always encourage OEM BIOS to follow the ACPI spec., if not, we'll
> ask them to remove _BCL, _BCM, _BQC functions.
> And Dell Inspiron 3138 is the first one that they refuse our request,
> so I would like to fix it in the kernel.

The best thing to do is to send a patch that flips the default on 
Windows 8 systems and get it pushed through the drm-next tree in order 
to work out the remaining bugs in the intel backlight driver.

> So, I think we probably need some quirks to disable acpi_video0 by the
> mean while before use_native_backlight is default true.

Sorry, I'm not adding any machine-specific quirks to fix generic 
problems.

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
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