linux-kernel - Re: [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8

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Date:	Tue, 10 Sep 2013 11:27:34 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Igor Gnatenko <i.gnatenko.brain@...il.com>
CC:	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Yves-Alexis Perez <corsac@...ian.org>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Lee Chun-Yi <jlee@...ell.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>
Subject: Re: [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware
 expects Windows 8

On 09/09/2013 07:44 PM, Igor Gnatenko wrote:
> On Mon, 2013-09-09 at 16:42 +0800, Aaron Lu wrote:
>> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
>> index f466980..75fba17 100644
>> --- a/drivers/gpu/drm/i915/i915_dma.c
>> +++ b/drivers/gpu/drm/i915/i915_dma.c
>> @@ -1650,7 +1650,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
>>  	if (INTEL_INFO(dev)->num_pipes) {
>>  		/* Must be done after probing outputs */
>>  		intel_opregion_init(dev);
>> -		acpi_video_register();
>> +		__acpi_video_register(i915_take_over_backlight);
>>  	}
>>  
>>  	if (IS_GEN5(dev))
> 
> I can't compile:
> 
> 
> DEBUG: drivers/gpu/drm/i915/i915_dma.c: In function 'i915_driver_load':
> DEBUG: drivers/gpu/drm/i915/i915_dma.c:1661:3: error: implicit
> declaration of function
> '__acpi_video_register' [-Werror=implicit-function-declaration]
> DEBUG:    __acpi_video_register(i915_take_over_backlight);
> DEBUG:    ^
> DEBUG: cc1: some warnings being treated as errors
> DEBUG: make[4]: *** [drivers/gpu/drm/i915/i915_dma.o] Error 1
> DEBUG: make[3]: *** [drivers/gpu/drm/i915] Error 2
> DEBUG: make[2]: *** [drivers/gpu/drm] Error 2
> DEBUG: make[1]: *** [drivers/gpu] Error 2
> DEBUG: make: *** [drivers] Error 2
> 

The two patches are based on top of Rafael's linux-next tree. I just
tried it again, no compile problem for me. I also tried on today Linus'
master tree, as there are some updates from i915, two conflicts exist.
I've just resolved them and will update it in next revision.
If you want to try it now, please use:
https://github.com/aaronlu/linux acpi_video_rework

Thanks,
Aaron
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