linux-kernel - Re: [ibm-acpi-devel] [PATCH] thinkpad-acpi: fix issuing duplicated key events for brightness up/down

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Message-ID: <4F966802.10907@canonical.com>
Date:	Tue, 24 Apr 2012 16:44:50 +0800
From:	Alex Hung <alex.hung@...onical.com>
To:	Alex Hung <alex.hung@...onical.com>
CC:	ibm-acpi@....eng.br, mjg@...hat.com,
	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [ibm-acpi-devel] [PATCH] thinkpad-acpi: fix issuing duplicated
 key events for brightness up/down

On 04/24/2012 04:40 PM, Alex Hung wrote:
> The tp_features.bright_acpimode will not be set correctly for brightness
> control because ACPI_VIDEO_HID will not be located in ACPI. As a result,
> a duplicated key event will always be sent. acpi_video_backlight_support()
> is sufficient to detect standard ACPI brightness control.
>
> Signed-off-by: Alex Hung<alex.hung@...onical.com>
> ---
>   drivers/platform/x86/thinkpad_acpi.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 7b82868..7d032d5 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -3405,7 +3405,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
>   	/* Do not issue duplicate brightness change events to
>   	 * userspace. tpacpi_detect_brightness_capabilities() must have
>   	 * been called before this point  */
> -	if (tp_features.bright_acpimode&&  acpi_video_backlight_support()) {
> +	if (acpi_video_backlight_support()) {
>   		pr_info("This ThinkPad has standard ACPI backlight "
>   			"brightness control, supported by the ACPI "
>   			"video driver\n");

Hi,
I tested the patch on thinkpad x200 and x220, and the brightness up/down 
key presses will no longer generate a duplicated event, i.e. output from 
"sudo showkey".

Best Regards,
Alex Hung
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