linux-kernel - Re: [PATCH v2] platform/x86: Add driver for Apple gmux device

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Date:	Thu, 15 Mar 2012 16:09:03 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform/x86: Add driver for Apple gmux device

On Thu, Mar 15, 2012 at 10:47:56AM -0500, Seth Forshee wrote:

> Turns out that acpi_video0 does work under Windows, and it also works
> under Linux depending on how the OS is booted. Doing a boot camp style
> boot gives us working acpi_video0 and apple_bl backlights. acpi_video1
> doesn't show up in a legacy boot situation, as evaluating _BCM gives an
> error.
> 
> Under EFI boot, both acpi_video backlights show up but neither works.
> The readback verify in apple_bl's probe fails, so that one doesn't show
> up. Only gmux_backlight actually works.

Ok, that's consistent. You can probably handle that case by just calling 
acpi_video_unregister() in gmux. Something like your patch looks fine 
for the apple_bl case.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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