linux-kernel - Re: [PATCH v3 0/5] apple-gmux: support MMIO gmux type on T2 Macs

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Message-ID: <BM1PR01MB09313E8C98F63BD65CCD3362B8A59@BM1PR01MB0931.INDPRD01.PROD.OUTLOOK.COM>
Date:   Tue, 21 Feb 2023 19:13:26 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Hans de Goede <hdegoede@...hat.com>
CC:     Orlando Chamberlain <orlandoch.dev@...il.com>,
        Mark Gross <markgross@...nel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lukas Wunner <lukas@...ner.de>,
        Seth Forshee <sforshee@...nel.org>,
        Aun-Ali Zaidi <admin@...eit.net>,
        Kerem Karabay <kekrby@...il.com>
Subject: Re: [PATCH v3 0/5] apple-gmux: support MMIO gmux type on T2 Macs


> Currently the backlight registration in apple-gmux.c is unconditional
> (if a GMUX is detected).
> 
> I have attached a patch to make it honor the acpi_backlight=xxx
> kernel commandline option like most other x86/ACPI backlight drivers
> do, please give this a test.
> 
> Regards,
> 
> Hans
> 

Also, another issue, I have pluymouth enabled with FRAMEBUFFER=y. After using the gmux patches, the size of the theme has become too tiny for an initial few seconds, then it gets normal. I tested this by compiling a kernel without these patches, and the bug got fixed. I also tried using acpi backlight using command line (that made me discover the `acpi_backlight=video` not working bug). Is that also related to some upstream bug?