linux-kernel - Re: [PATCH] acpi/video: lcd_get_level_current doen't return current level

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Message-ID: <3fb82299-bdb9-4842-bd55-f3b87d2d789e@email.android.com>
Date:	Sun, 31 Mar 2013 08:15:14 +0200
From:	Danny Baumann <dannybaumann@....de>
To:	Artem Savkov <artem.savkov@...il.com>
CC:	aaron.lu@...el.com, rafael.j.wysocki@...el.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] acpi/video: lcd_get_level_current doen't return current level

Artem Savkov <artem.savkov@...il.com> schrieb:

>acpi_video_device_lcd_get_level_current() called
>acpi_video_bqc_value_to_level()
>with "*level" as a second argument, resulting in level being returned
>based on
>initial input, not current brightness, breaking backlight controls.

I don't think this change is correct. As level was passed as parameter into the evaluation of _BQC, *level contains the AML returned brightness level afterwards, so it's correct to use it as an input to acpi_video_bqc_value_to_level(). Actually, the whole point of acpi_video_device_lcd_get_level_current() is to update device->brightness->curr, so it doesn't make sense to me to use it in that function.

What's the exact problem this patch tries to solve?

Regards,

Danny
Hi,
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