linux-kernel - Re: Two regressions in 4.12-rc on Baytrail/T: #1 Pinctrol or WMI

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Date:   Wed, 7 Jun 2017 18:38:42 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Alan Cox <alan@...yncelyn.cymru>
Cc:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: Two regressions in 4.12-rc on Baytrail/T: #1 Pinctrol or WMI

On Wed, Jun 07, 2017 at 04:20:44PM +0100, Alan Cox wrote:
> ASUS T100TA, BIOS 3.07, machine version is the variant with the windows
> logo on the frame and no Energy Star logo.
> 
> The first one is in the pin controller (or I guess WMI) which now spews
> the (non fatal)
> 
> [   22.491352] Potential Error: Setting GPIO with direct_irq_en to output

Yeah, this sounds like a bug in the BIOS. The direct_irq_en is set which
means that the GPIO is routed directly to the IO-APIC (and is expected
to be input) but the device in question (WMI?) probably has some ACPI
method that uses the GPIO via ACPI Operation Region as output.