linux-kernel - Re: [PATCH 00/22] Fallback to native backlight

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Date:   Mon, 24 Oct 2022 21:11:08 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Akihiko Odaki <akihiko.odaki@...nix.com>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jonathan Corbet <corbet@....net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        "Lee, Chun-Yi" <jlee@...e.com>, Mark Gross <markgross@...nel.org>,
        Corentin Chary <corentin.chary@...il.com>,
        Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Pali Rohár <pali@...nel.org>,
        Jonathan Woithe <jwoithe@...t42.net>,
        Ike Panhc <ike.pan@...onical.com>,
        Daniel Dadap <ddadap@...dia.com>,
        Kenneth Chan <kenneth.t.chan@...il.com>,
        Mattia Dongili <malattia@...ux.it>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Azael Avalos <coproscefalo@...il.com>,
        Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>,
        Robert Moore <robert.moore@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org,
        platform-driver-x86@...r.kernel.org,
        acpi4asus-user@...ts.sourceforge.net,
        ibm-acpi-devel@...ts.sourceforge.net, linux-fbdev@...r.kernel.org,
        devel@...ica.org
Subject: Re: [PATCH 00/22] Fallback to native backlight

On Tue, 25 Oct 2022, Akihiko Odaki <akihiko.odaki@...nix.com> wrote:
> That aside, the first patch in this series can be applied without the 
> later patches so you may have a look at it. It's fine if you don't merge 
> it though since it does not fix really a pragmatic bug as its message says.

I think it's problematic because it needlessly ties i915 backlight
operation to existence of backlight devices that may not be related to
Intel GPU at all. The direction should be multiple supported backlight
devices, across GPUs and connectors, but only one per display.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center