TV & HTPC power up sequence issue --HDMI detection (1 Viewer)

[winterescape]

I have a Panasonic plasma TV (TH-42PX60U) connected over HDMI to my HTPC. The HTPC is a based on a Asus M3N78-EM Mobo with Nvidia 8300 IGP running windows XP, latest Nvidia drivers and windows updates.

If the TV is turned on and then the PC booted, it works.

If the PC starts first or if the TV is turned off while the PC is on and then the TV is turned back on the screen is blank and I must reboot the PC to get the picture back.

I am trying to figure out an easy way to make the PC think the display is always on. Any suggestions?

I have read about EDID override and wonder if that might help. I think all I need to figure out is how to prevent windows from detecting the TV being turned off or make it think the TV is always connected and powered up. Thanks in advance for any suggestions......

This happens all the time with MP 1.02 but it also happened with MP1.01 and 1.00 sometimes.
I also can get it to do this when MP is not running, TV server is, just on the windows XP desktop so I do not think it is a MP 1.02 issue just a config issue unique to my system or the NVIDIA drivers of some sort...
Thanks...

 

[tourettes]

Force Display detection - NVIDIA Forums

That worked for me when I was using XP + Nvidia.

 

[Kronos]

Black screen if TV starts later than HTPC

HI all,

I have the same problem with ATI HD3200 on MA-78GM-S2H rev 1.0. with a Panasonic TX-PZ85.

Is there any solution for ATI?

I use to turn on TV and change input before turning on HTPC but not my wife and you can guess what...

Thanks!

 

[robbo100]

I had a very similar problem with my 9400GT cards.

See post 13 here for my solution.

Let me know if it works as no-one else has fed back to me about it.

Robbo100

 

[Owlsroost]

I have basically the same issue on Vista (Panasonic LCD TV + 9500GT).

The only working solution I've found is:

1. Leave the TV on standby (don't power it off completely).

2. Run 'msconfig' (start menu -> run), select 'services' tab and disable the nVidia driver service, then reboot (with the TV on). This service seems to be responsible for watching for changes to devices connected to the video card.

3. Always put the PC to sleep/standby (not off) - resume from standby should now work OK provided the TV is at least on standby.

Tony

 

[Owlsroost]

HI all,

I have the same problem with ATI HD3200 on MA-78GM-S2H rev 1.0. with a Panasonic TX-PZ85.

Is there any solution for ATI?

I use to turn on TV and change input before turning on HTPC but not my wife and you can guess what...

Thanks!

From memory (I don't run an ATi card any more):

There's a setting in Catalyst control centre controlling monitor detection - set it to 'manual' rather than automatic.

If that doesn't help, run up 'msconfig' and disable the "ATI Hotkey Poller" service ("Ati External Event Utility" on Vista) - this disables on-the-fly monitor detection.

Tony

 

[winterescape]

I had a very similar problem with my 9400GT cards.

See post 13 here for my solution.

Let me know if it works as no-one else has fed back to me about it.

Robbo100

This did not work for me , thanks for the suggestion...

I have basically the same issue on Vista (Panasonic LCD TV + 9500GT).

The only working solution I've found is:

1. Leave the TV on standby (don't power it off completely).

2. Run 'msconfig' (start menu -> run), select 'services' tab and disable the nVidia driver service, then reboot (with the TV on). This service seems to be responsible for watching for changes to devices connected to the video card.

3. Always put the PC to sleep/standby (not off) - resume from standby should now work OK provided the TV is at least on standby.

Tony

This sounded the most promising, and I did make progress with this suggestion. If I turn the TV off and back on with this service disabled the picture comes back now but if I let the PC go to sleep and wake it back up without the TV on, no picture...


Thanks for the other suggestions and links to the other threads posted above I will read the other posts and keep working on it when I get some more time...

 

[kiwijunglist]

Try HdmiOn.exe - HdmiOn | thydzik's technology blog
You could assign it to either a hotkey / remote shortcut or setup to auto run on wakeup.

The other thing to try is disable the "ati external event utility" in vista. start search for services.msc and then right click to run it as administrator. then find it in the list and click properties and disable, you need to restart your pc for changes to take effect.

 

[Owlsroost]

The only other solution I know of is putting a Gefen 'DVI-detective' box between the PC and TV (Monoprice sell something similar in US too) - this pretends to be the TV, so the PC always detects it on start up.

(The base problem here is that Panasonic don't implement the EDID circuitry properly, so the EDID information isn't available - as it should be - when the TV is off. This is compounded by Windows/nVidia head-in-the-sand attitude to not providing any way to force re-detection of DVI/HDMI monitors....aarg! ).

Tony

 

[kiwijunglist]

+1 gefen will defenitely fix, i used to use a gefen for a similar problem. However try HdmiOn first.

Gefen's DVI Detective or Monoprice's DVI Doctor (same thing)

EDIT: I have a feeling that there is a new version of dvi detective that can pass through the hdcp handshake for HDVD and blueray with HDCP protection