linux-kernel - Re: Linux 3.2-rc1

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Message-ID: <20111110115712.GA6492@localhost>
Date:	Thu, 10 Nov 2011 19:57:12 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Nick Bowler <nbowler@...iptictech.com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Keith Packard <keithp@...thp.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.2-rc1

Hi Nick,

On Wed, Nov 09, 2011 at 03:40:19PM +0800, Takashi Iwai wrote:
> At Tue, 8 Nov 2011 12:23:30 -0800,
> Linus Torvalds wrote:
> > 
> > Hmm, I don't know what caused this to trigger, but I'm adding both the
> > i915 people and the HDA people to the cc, and they can fight to the
> > death about this in the HDMI Thunderdome.
> 
> It must be the new addition of ELD-passing code.
> 
> Fengguang, can the drm or i915 driver check whether ELD is changed or
> not?  Writing ELD at each time even when unchanged confuses the audio
> side, as if the monitor is hotplugged.

The attached patch is tested OK to prevent extra hot plug events.

However it has one side effect: when HDMI monitor is hot removed,
the ELD keeps remain valid. I need to find a way to test for the
presence of the monitor and handle that case as well. When all done,
I'll submit the patches together for review.

Thanks,
Fengguang

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