linux-kernel - Re: [PATCH] backlight: apple_bl: Use acpi_video_get_backlight

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Date:   Thu, 9 Mar 2023 17:09:11 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...nel.org>, Lee Jones <lee@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Aditya Garg <gargaditya08@...e.com>,
        platform-driver-x86@...r.kernel.org,
        Matthew Garrett <mjg59@...f.ucam.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] backlight: apple_bl: Use acpi_video_get_backlight_type()

On Tue, Mar 07, 2023 at 01:05:40PM +0100, Hans de Goede wrote:
> On some MacBooks both the apple_bl and the apple-gmux backlight drivers
> may be able to export a /sys/class/backlight device.
>
> To avoid having 2 backlight devices for one LCD panel until now
> the apple-gmux driver has been calling apple_bl_unregister() to move
> the apple_bl backlight device out of the way when it loads.
>
> Similar problems exist on other x86 laptops and all backlight drivers
> which may be used on x86 laptops have moved to using
> acpi_video_get_backlight_type() to determine whether they should load
> or not.
>
> Switch apple_bl to this model too, so that it is consistent with all
> the other x86 backlight drivers.
> [snip]
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>

but...

> ---
> A note to the backlight class / subsystem maintainers, this change
> applies on top of a similar patch for drivers/platform/x86/apple-gmux.c
> which makes that driver use acpi_video_get_backlight_type(). See:
> https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans
>
> I believe it is easiest to also merge this patch through
> the platform-drivers-x86 tree, may I please have your Ack for this ?
> ---

... please don't treat above as an ack. Lee Jones will hopefully be
along shortly to discuss that!


Daniel.