https://bugs.freedesktop.org/show_bug.cgi?id=47007
--- Comment #5 from Tvrtko Ursulin tvrtko.ursulin@onelan.co.uk 2012-03-06 08:15:32 PST --- (In reply to comment #1)
Please attach your xorg log and dmesg output. Unless the OEM forgot to wire up the hotplug pin, the driver shouldn't be polling. Check to make sure your desktop environment is not manually polling (gnome power manager or the kde equivalent, etc.).
Also, there are no stalls when the VGA output is used (HDMI disconnected).