Re: [PATCH 0/3] ACPI: video/apple-gmux: Improve apple-gmux backlight detection

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On Mon, Jan 23, 2023 at 12:37:47PM +0100, Hans de Goede wrote:
> Some apple laptop models have an ACPI device with a HID of APP000B
> and that device has an IO resource (so it does not describe the new
> unsupported MMIO based gmux type), but there actually is no gmux
> in the laptop at all.
> 
> This patch-series improves the drivers/acpi/video_detect.c so that
> it no longer tries to use the non present gmux in this case.
> 
> Note I'm still waiting for testing feedback from the reporter of
> this problem. But from the logs the problem is clear
> (the logs show: "apple_gmux: gmux device not present")

Please provide a link to the original report.  I would also like to
know the exact MacBook model used and I would like to see full dmesg
output as well as an acpidump.

What you're saying here is that there's a fake APP000B device present
in DSDT and I have a hard time believng that.  We need to find out
what's really going on and how macOS handles this.

Thanks,

Lukas



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