linux-kernel - apple_gmux: switcheroo not working on a 2013 MBP

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Message-ID: <CALkWK0=--MxTMTmdYzKotUfbctgc09rJ6R=9WB2XHTP-jnbz-A@mail.gmail.com>
Date:	Tue, 7 Jan 2014 01:28:55 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Andreas Heider <andreas@...tr.de>,
	Seth Forshee <seth.forshee@...onical.com>
Subject: apple_gmux: switcheroo not working on a 2013 MBP

Hi,

I loaded the apple_gmux driver and tried to:

  $ echo IGD >/sys/kernel/debug/vgaswitcheroo/switch

dmesg responds with:

  vga_switcheroo: client 1 refused switch

It's possible that the gmux interface has changed since the driver was
originally written. How do I dig deeper into the issue and help fix
the driver?

Thanks.

Ram
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