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HTPC HDMI losing signal with static

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January 6, 2013 2:19:48 PM

Long time lurker, first time poster.

I built an HTPC with i5 3550K and Asrock Pro3 z77 motherboard and have a weird issue when going from one HDMI connection to another. When I start the HTPC, there are no issues; the signal comes and the TV displays properly. Now when I change the source to another HDMI port and then come back to the port in which the HTPC is connected, I lose signal and I keep getting some white noise static etc. This happens only if I switch between different HDMI ports! The signal comes back when I disconnect the device (non HTPC device in this case ROKU) from the other HDMI port. I dont think it is the HDMI ports as this doesnt happen with any other devices I connect

I have an nMediapc 2000b case if that matters. Any hhelp solutions would be greatly appreciated. thanks!
a b V Motherboard
January 6, 2013 3:45:30 PM

Sounds like the TV is loosing the HDCP sync or your HTPC send the graphic to sleep, because not monitor is detected. Look for a firmware update for your TV.
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January 6, 2013 5:51:59 PM

Quote:
Sounds like the TV is loosing the HDCP sync or your HTPC send the graphic to sleep, because not monitor is detected. Look for a firmware update for your TV.

Thanks for the quick reply; would that explain the fact that the signal comes back when remove the non-htpc device. and that the signal is lost only when I cycle between inputs.

Although I say that the signal is lost, what really happens is when I cycle to htpc the second time, I get a grained white noise kind of screen with lots of static

The TV does have the latest firmware; also I didnt have this problem when I had a different computer connected earlier; that was a gigabyte MB with AMD processor. I dont know whether I am making things more confusing, but this is just driving me nuts
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a b V Motherboard
January 6, 2013 6:08:09 PM

So it seems to be on the HTPC side. Maybe energy options for the graphics? Difficult to analyze without an intel graphics though - sorry.
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January 6, 2013 7:05:36 PM

Btw, the signal comes back on when I put the computer to sleep and turn it back on.

Thanks for your help. I dont have a discrete graphic card; just the intel integrated one. How would you manage the energy options for that. Thanks
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a b V Motherboard
January 6, 2013 8:14:17 PM

Go to Power Settings and change your plan settings to never turn off the display....
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January 6, 2013 8:34:36 PM

Thanks; that didnt work either. I think it is something to do with hdcp compliance. every time I turn the TV off or put the computer to sleep and turn it on, the display comes back
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a b V Motherboard
January 6, 2013 9:04:21 PM

You might be right, maybe put it to sleep when you're changing hdmi configuration. That's my only idea....
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January 7, 2013 12:57:53 AM

That might be an option but will cause issues when I am recording something; I plan to roll back the intel hd 4000 drivers to see if that will make a difference. will post the results.

i am more convinced than ever that it is a handshake problem
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January 8, 2013 6:28:27 PM

It was bothering me so much that I ended up reinstalling the operating system. I kept checking when the prblem starts. It seems like this happens only after the intel hd 4000 driver is installed. Till then there is no issue; any ideas on what to do..
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January 10, 2013 2:03:23 AM

noidea_77 said:
It seams to be an knows problem! I was to lazy to read it all, bit there seams to be a "restart" solution somewhere down the page (search for hdcp): http://communities.intel.com/message/169503

I didnt try this yet because i was having issues after i restart and then I change sources. today I used a different hdmi cable and that seems to have solved it. I dont know for how long but happy for the time being. thanks everyone
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