windows 7 - How to prevent turned off monitor when using a HDMI splitter

07
2014-07
  • fancyPants

    I have the strange problem, that my monitor turns off, when I use a HDMI splitter. I want to send my monitor output to a raspberry pi, so I bought a HDMI splitter. When the computer starts, just after displaying the windows logo but before displaying the windows UI the monitor turns off. When I start windows in safe mode, it doesn't do this. I'm using the nvidia gtx 550 graphics card, installed the latest driver 337 but didn't find any option that would reasonably stop windows from turning off my monitor.

    Does someone know how I can prevent this? Oh, the monitor just has DVI input if that matters, I'm using a HDMI-to-DVI cable to connect from HDMI splitter to monitor. And of course, when not using the splitter, but directly connecting from PC to monitor with HDMI-to-DVI cable it also works just fine.

    Thanks in advance.

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  • daremon

    I use a Toshiba Portege laptop. I also have an LG W2452V monitor hooked up via HDMI. The notebook lid is normally closed and I only use the monitor.

    Today the monitor refuses to show anything. However it seems as if it has signal.

    Some tests I did:

    • If i unplug the HDMI cable I can hear the Windows "device disconnected sound". The monitor displays the "No signal" message and the LED turns yellow. When I plug the cable again I hear the "device connected sound" from Windows, the "No signal" message is removed from the monitor, the monitor LED turns blue, the whole screen lights up as if it's going to display something and then nothing...

    • Same behavior if I use the special laptop button that shifts through the available signal modes. E.g. if I pick "laptop LCD only" the monitor shuts down. If I pick the HDMI or HDMI/LaptopMonitor the monitor shows the above signs but it doesn't show anything.

    • Using the "Extend desktop to second monitor" has the same results. The mouse cursor can move to the monitor but nothing is displayed...

    Any ideas?


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  • anon man

    i actually had this happen with my dell laptop last night that i had plugged into my tv. the only way i could get it working again was to reboot the machine. i was assuming there was an issue when the laptop went into screensaver or sleep mode and just wouldn't disply back on correctly. haven't looked too much into it yet, but the reboot did fix my issue.

  • daremon

    I unplugged and replugged the monitor power and this fixed it. Weird but at least everything is OK now.