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NUC Drops HDMI Device

L

Liggywuh

Limp Gawd
Joined
Jan 26, 2010
Messages
388
Hello there. I am not sure if the best place for this is in the SFF systems forum, or here, but anyway...

I have the Intel NUC with LAN port (no TB).

All the latest drivers, running Win 8 Pro. It seems to be that the audio HDMI device disappears about 90% of the time you hard power off the screen (TV). With all other graphics cards, it says disconnected when the screen is not present, but with this one the HDMI device is not there at all.

Restarting the PC brings the HDMI device back.

Even weirder, I have got a USB to Optical conveter, and you can hear the "device disconnected" sound, when you turn off the TV, so it knows that the HDMI device has been disconnected.

Of course, I could run the TV in standby, or use all audio out to the hifi... but I shouldn't have to.

Any ideas why this is behaving like it is?
 
yep , this is part of the HDCP handshake and HDMI CEC/control. It is normal behavior and it sucks.

unlike a s/pdif that acts like an endpoint regardless if it is actually connected, HDMI doesn't "render" to a non-existent endpoint.

So once the TV powers down it effectively disables that HDMI connection as a valid path and acts the same as no connection at all.

It isn't really misbehaving as much as being inconvenient because it wants to act like a normal HDMI device rather than a PC.

This isn't strictly a Intel issue either, most AMD/ati and Nvidia cards do the same thing and technically it is the TV's fault for not re-sending the handshake request.

Look in the TV's menus for HDMI CEC or control and if it is on turn it off , if it's off turn it on and see if it maintains the connection.

Some AVRs and HDMI switches can help with this by keeping a active HDMI connection even when "off" or in standby.

Updated display driver might help this in the future but since it is a feature of windows to disable HDMI output if it isn't "connected" (as per the HDMI spec) "fixing" it normally has to be done down the chain.

It's even worse if you have multiple displays and changing the TV's input changes which display the desktop gets show on and all your icons.
 
Thanks for the fast reply!

I will try turning Viera Control off then.

I have only had experience of running the same TV to my HD5850, when the TV was powered down it just said that the device was disconnected, but on this intel machine it just disapears completely :p

I will report back after next power cycle :p
 
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