linux-kernel - Re: [PATCH V2 2/2] apple_gmux: Add support for newer hardware

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Date:	Tue, 14 Aug 2012 10:15:43 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Bernhard Froemel <froemel@...rs.tuwien.ac.at>
Cc:	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH V2 2/2] apple_gmux: Add support for newer hardware

On Tue, Aug 14, 2012 at 04:53:47PM +0200, Bernhard Froemel wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Only in relation to Seth's future apple-gmux patch series about
> vgaswitcheroo and restoring the gmux device configuration across
> suspend/resume [1]:
> On resume the gmux registers 0x28 (DDC) and 0x10 (SWITCH_DISPLAY)
> (i.e., the first two writes) are not restored (result: the screen
> remains black after suspend/resume).
> 
> Of course, this does not happen with my patch proposal ;)
> Unfortunately, I have not the time to sort this out in the next couple
> of days -- on the other hand this is probably not a problem w.r.t.
> this patch, but needs to be taken care of in Seth's patch series.

The patch adding support for switcheroo *does* restore those registers
on resume. Are you saying that isn't happening when you use it?

Seth

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