From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: [PATCH 0/3] Make HDMI ELD usable with hotplug
Date: Mon, 18 Feb 2013 14:35:29 +0100
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References: <1361193073-7199-1-git-send-email-david.henningsson@canonical.com>
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To: David Henningsson <david.henningsson@canonical.com>
Cc: alsa-devel@alsa-project.org, fengguang.wu@intel.com, pierre-louis.bossart@linux.intel.com, Wang Xingchao <xingchao.wang@intel.com>
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At Mon, 18 Feb 2013 14:11:10 +0100,
David Henningsson wrote:
> 
> I'm experimenting with using ELD information in PulseAudio and found
> that it didn't work very well with hotplugging.
> Neither the proc file nor the ELD kcontrol was cleared correctly after
> unplug, and there was no way (except polling) to find out when ELD
> has become available.

Did you try Xingchao's patch for drm/i915?  It's queued in
drm-intel-next:

    commit 7b9f35a6dd72f89452c58bbdbaf063027bf857ec
    Author: Wang Xingchao <xingchao.wang@intel.com>
    Date:   Tue Jan 22 23:25:25 2013 +0800

    drm/i915: HDMI/DP - ELD info refresh support for Haswell
    

Takashi