Hmm. We get a hotplug disconnection event from the HDMI:
[ 6866.046586] [drm:drm_helper_hpd_irq_event], [CONNECTOR:20:HDMI-A-3]
status updated from 1 to 2
and then proceed to turn it off. We've been having issues with HDMI
hotplug detection on IvyBridge and there is one patch en route that
should help:
commit 202adf4b9f5957b26a1cb97267d78e0edb319c5e
Author: Daniel Vetter <daniel.vet...@ffwll.ch>
Date: Fri Feb 22 00:53:04 2013 +0100
drm/i915: Revert hdmi HDP pin checks
Hopefully that will turn up in the Ubuntu kernel in time.
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https://bugs.launchpad.net/bugs/1135668
Title:
Intel graphics fails when bringing monitor out of sleep
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