linux-kernel - Fwd: Does not work backlight on Chromebook XE303C12 with Kernel version 6.3.4

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Message-ID: <288db372-9797-540f-e8bd-794a23648573@gmail.com>
Date:   Fri, 26 May 2023 20:46:32 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        DRI Development List <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Samsung SoC Support <linux-samsung-soc@...r.kernel.org>
Cc:     Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andrew <quark@...root.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Fwd: Does not work backlight on Chromebook XE303C12 with Kernel
 version 6.3.4

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> I did check it by flashlight. Even with all available backlights drivers compiled as modules it does not work. With Kernel version 5.15.106 backlight works fine.
> Kernels for Chomebook uses dtb files that have some backlight config set (used gpio), like exynos5250-snow-common.dtsi and dmesg of 6.3.4 gives some gpio warnings. Maybe cause in it.

See bugzilla for the full thread and attached dmesg & kernel config.

Anyway, I'm adding it to regzbot:

#regzbot introduced: v5.15..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217489
#regzbot title: Chromebook XE303C12 backlight stopped working with gpio warnings

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217489

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