https://bugs.freedesktop.org/show_bug.cgi?id=47007
--- Comment #17 from Tvrtko Ursulin tvrtko.ursulin@onelan.co.uk 2012-03-15 03:52:33 PDT --- (In reply to comment #16)
Furthermore, I've left in the bit which trusts HPD sense on R600+ ASICs, meaning as long as HPD sense remained unchanged, connector detect functions will bail out early.
Wrong wording here, I did not leave it in, but it is also required to avoid VGA connector triggering polls on for example HDMI, where HPD is not shared.