linux-kernel - Re: [PATCH] apple-gmux: Restore switch registers on suspend/resume

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Date:	Wed, 01 Aug 2012 20:41:42 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Andreas Heider <andreas@...tr.de>,
	Arun Raghavan <arun.raghavan@...labora.co.uk>,
	linux-kernel@...r.kernel.org, airlied@...hat.com
Subject: Re: [PATCH] apple-gmux: Restore switch registers on suspend/resume

On Wed, 2012-08-01 at 10:59 -0500, Seth Forshee wrote:
> I don't think the mini-DP port works at all with the integrated
> graphics, at least not on a Macbook Pro 8,2. I played around with it
> yesterday under OS X. When using the DGPU with an external monitor it
> works fine, but any attempts to switch to the IGPU were rejected by the
> drivers. If I forced it to the IGPU prior to connecting the external
> monitor the screen just remained blank when I plugged it in, until I
> switched back to the DGPU. It's odd though that the DDC can be switched
> over to the IGPU.

I get a blank screen when I use the VGA adapter, and with the dual-link
DVI adapter I get a barely responsive machine continually printing 
[ 1076.439623] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
as described at https://bugzilla.redhat.com/show_bug.cgi?id=843779#c8
And a blank screen.

I thought someone had said they'd got it working with a native DP
monitor, rather than the converters.

> Iirc you've got the 8,3, and I'd expect it to be identical to the 8,2 in
> this respect. Also, the only reason my LVDS didn't work was because I
> wasn't telling i915 to disable SSC. I've got a patch to add a quirk for
> this that I'll send soon, since there still doesn't seem to be any way
> to get the vbios for the Intel graphics.

I think your patch won't cover the 8,3.

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Apple Computer Inc. Device [106b:00de]

-- 
dwmw2

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