linux-kernel - Re: [PATCH 2/7] drivers-platform-x86: use acpi_video_dmi_promote

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Date:	Thu, 14 Jun 2012 17:58:57 +0800
From:	joeyli <jlee@...e.com>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	Len Brown <lenb@...nel.org>, Matthew Garrett <mjg59@...f.ucam.org>,
	linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
	Joey Lee <jlee@...ell.com>, Matthew Garrett <mjg@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] drivers-platform-x86: use
 acpi_video_dmi_promote_vendor()

Hi Corentin, 

於 三，2012-06-13 於 09:32 +0200，Corentin Chary 提到：
> Instead of using directly acpi_video_unregister(), use
> acpi_video_dmi_promote_vendor() (and make it call
> acpi_video_unregister() if needed)
> 
> Signed-off-by: Corentin Chary <corentin.chary@...il.com>
> ---
>  drivers/platform/x86/acer-wmi.c       |   16 +++++++++-------
>  drivers/platform/x86/apple-gmux.c     |    6 ++++++
>  drivers/platform/x86/samsung-laptop.c |   22 ++++++++++++----------
>  3 files changed, 27 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> index ce875dc..ffc53df 100644
> --- a/drivers/platform/x86/acer-wmi.c
> +++ b/drivers/platform/x86/acer-wmi.c
> @@ -2060,14 +2060,16 @@ static int __init acer_wmi_init(void)
>  
>  	set_quirks();
>  
> +	if (dmi_check_system(video_vendor_dmi_table))
> +		acpi_video_dmi_promote_vendor();
>  	if (acpi_video_backlight_support()) {
> -		if (dmi_check_system(video_vendor_dmi_table)) {
> -			acpi_video_unregister();
> -		} else {
> -			interface->capability &= ~ACER_CAP_BRIGHTNESS;
> -			pr_info("Brightness must be controlled by "
> -				"acpi video driver\n");
> -		}
> +		interface->capability &= ~ACER_CAP_BRIGHTNESS;
> +		pr_info("Brightness must be controlled by acpi video driver\n");
> +	} else {
> +#ifdef CONFIG_ACPI_VIDEO

The 'ifdef CONFIG_ACPI_VIDEO' didn't work on my machine with v3.4
kernel, the acpi video didn't unregister. 

My autoconf.h like following:

include/generated/autoconf.h:#define CONFIG_ACPI_VIDEO_MODULE 1


Need use:

-#ifdef CONFIG_ACPI_VIDEO
+#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
	pr_info("Disabling ACPI video driver\n"); 
	acpi_video_unregister();
#endif

I tested the above change works to me.


Thanks a lot!
Joey Lee

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