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HDMI is unreliable with nvidia optimus on asus n53sv


I am running ubuntu 12.04 LTS with latest packages all software including bumblebee.
The laptop is an asus n53sv

If a HDMI display is plugged in, it can work, but mostly does not.
If a sony monitor is plugged in immediately after the grub menu, then the monitor displays either on boot
or after a disconnect/reconnect/redisplay cycle.
A panasonic plasma TV did work, once, but now does not.

HDMI displays are always detected by the software, either xrandr or settings/displays, when activated, with correct resolutions
in displays. 

Any ideas on this welcome,
Peter Garrone

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