[alsa-devel] [PATCH 2/2] hda - delayed ELD repoll

Stephen Warren swarren at nvidia.com
Tue Nov 15 19:25:00 CET 2011

Wu Fengguang wrote at Tuesday, November 15, 2011 7:33 AM:
> The Intel HDMI chips (ironlake at least) are found to have ~250ms delay
> between the ELD_Valid=1 hotplug event is send and the ELD buffer becomes
> actually readable. During the time the ELD buffer is mysteriously all 0.
> Fix it by scheduling a delayed work to re-read ELD buffer after 300ms.

Any idea why; is the graphics driver writing the ELD data to the audio HW
after triggering the unsolicited even rather than before, or something
like that? 250mS almost sounds like it's setting ELDV in the audio HW,
then going and reading the EDID, then writing the EDID to the audio HW;
perhaps the graphics driver is accidentally setting PRESENT+ELDV when it's
meant to be setting just PRESENT, and later setting ELDV?


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