[Bug 47007] HDMI monitor polling causing 100ms rendering stalls

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47007

--- Comment #7 from Tvrtko Ursulin <tvrtko.ursulin at onelan.co.uk> 2012-03-07 02:42:18 PST ---
Poll helper is running every ten seconds because VGA connector "asks it to",
given how it has DRM_CONNECTOR_POLL_CONNECT set.

Since the poll helper runs, and HDMI connector has DRM_CONNECTOR_POLL_HPD set
due to hpd.hpd being not RADEON_HPD_NONE, it calls it's detect method
(radeon_dvi_detect).

This in turns discards an re-fetches the full EDID every time it runs.

What is the bug here?

1. That HDMI connector has DRM_CONNECTOR_POLL_HPD set when hpd.hpd is not
RADEON_HPD_NONE?
2. That discard and full fetch of EDID is done when is not needed?

Or both? Or something else? Hard to say for me. HPD sounds like Hotplug detect?
So setting that DRM_CONNECTOR_POLL_HPD when the connector supports something
other than RADEON_HPD_NONE sounds fishy to me.

But re-fetching full EDID is also silly. Might not be relevant if the detect
"method" should not run in the first place...

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