linux-kernel - Re: [PATCH] acpi-video: Fix brightness keys for Thinkpad X240

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Date:	Thu, 23 Jul 2015 01:40:18 +0000
From:	"Lu, Aaron" <aaron.lu@...el.com>
To:	"m.othacehe@...il.com" <m.othacehe@...il.com>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] acpi-video: Fix brightness keys for Thinkpad X240

On Wed, 2015-07-22 at 07:52 +0200, Mathieu OTHACEHE wrote:
> Thinkpad X240 laptop has a working acpi_video backlight control but
> using the default native backlight control, brightness keys does not 
> work.

Is it because the events are not sent to user space?

Can you please file a bug in https://bugzilla.kernel.org/ under the
ACPI/Power-Video category and attach its acpidump/dmesg there? Thanks.

Regards,
Aaron

> 
> This patch force acpi_video use for this laptop by adding an 
> exception in
> video_detect_dmi_table.
> 
> Signed-off-by: Mathieu OTHACEHE <m.othacehe@...il.com>
> ---
>  drivers/acpi/video_detect.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/acpi/video_detect.c 
> b/drivers/acpi/video_detect.c
> index 815f75e..c4bc5f2 100644
> --- a/drivers/acpi/video_detect.c
> +++ b/drivers/acpi/video_detect.c
> @@ -173,6 +173,14 @@ static const struct dmi_system_id 
> video_detect_dmi_table[] = {
>  		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
>  		},
>  	},
> +	{
> +	 .callback = video_detect_force_video,
> +	 .ident = "ThinkPad X240",
> +	 .matches = {
> +		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> +		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X240"),
> +		},
> +	},
>  
>  	/* The native backlight controls do not work on some older 
> machines */
>  	{