linux-kernel - Should asus-wmi provide a way to switch displays, and why video

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Message-ID: <AANLkTimf3SL+BpzjVK=F9y4_dGnDp6ghmMKq5k=4hs0x@mail.gmail.com>
Date:	Tue, 15 Feb 2011 07:53:09 +0100
From:	Corentin Chary <corentin.chary@...il.com>
To:	platform-driver-x86@...r.kernel.org
Cc:	linux acpi <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Luming Yu <luming.yu@...el.com>
Subject: Should asus-wmi provide a way to switch displays, and why
 video_output class is unused

Hi,
In the ongoing effort to split eeepc-wmi, and add support for Asus WMI
capable notebooks, I found that some of them are able to control
dispay output.
Currently, asus-laptop, asus_acpi and eeepc-laptop are also all able
to do that, and they use a simple sysfs file with a bitmask to do
that.

Now, I was searching the right, generic way to do that, and I found
video_output class. The issue is that nobody, even acpi/video.ko, use
it.

So, what's the right way to do that ?

Note, that in my case, I can't know what output are available, so
anyway, using video_output would be a little tricky. But still, I'm
not really comfortable adding another cryptic sysfs file, even with
proper documentation in Docuementation/ABI/.

Thanks,
-- 
Corentin Chary
http://xf.iksaif.net
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