HDMI switch handshake issues?

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  • spleenharvester
    Badcaps Veteran
    • Mar 2010
    • 882
    • UK

    #1

    HDMI switch handshake issues?

    Hi all,

    Got a bit of an odd problem with my setup. I have a cheapo 3 in/2 duplicate out HDMI splitter (this one). One output is connected to a HP 24fw display, whereas a computer (800 G1 USDT with Intel HD 4600 graphics) is connected to one of the inputs, and two consoles are connected to the others.

    The consoles work absolutely fine with it all the time, but the computer refuses to output video after it's been in standby for a while. The input light flashes on - the output light flashes on - then the output light goes off, then the input light goes off, and this cycle repeats forever. It will only come on after unplugging/replugging a bunch of times.

    I know this is a hopelessly vague problem but has anyone got any idea how to fix this? I've tried different cables etc and no change.

    Cheers
    Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: HDMI switch handshake issues?

    When it works, does the PC identify the sink as 'HP 24fw' (PC detects the EDID of HP).
    What is other sink connected to the second HDMI output?
    Can the EDID mode of the device be set?
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • spleenharvester
      Badcaps Veteran
      • Mar 2010
      • 882
      • UK

      #3
      Re: HDMI switch handshake issues?

      Originally posted by budm
      When it works, does the PC identify the sink as 'HP 24fw' (PC detects the EDID of HP).
      What is other sink connected to the second HDMI output?
      Can the EDID mode of the device be set?
      1. Surprisingly yes it does,
      2. Nothing on the second HDMI output at the moment,
      3. Unfortunately not - only DDC/CI settings and they don't seem to affect the problem,

      Cheers
      Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

      Comment

      • SMDFlea
        Super Moderator
        • Jan 2018
        • 20276
        • UK

        #4
        Re: HDMI switch handshake issues?

        What bios version does the pc have . Looking through the bios release notes - v02.59 Rev.A - Fixed the intermittent S3 resume issue .
        If your bios is older that that version update it ,it might fix your problem.
        Last edited by SMDFlea; 05-09-2020, 07:27 AM.
        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

        Comment

        • spleenharvester
          Badcaps Veteran
          • Mar 2010
          • 882
          • UK

          #5
          Re: HDMI switch handshake issues?

          Latest one unfortunately! Only workaround I've been able to find is setting "Monitor Off:" to "Never" in power options. Not ideal but it does the trick.
          Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

          Comment

          • SMDFlea
            Super Moderator
            • Jan 2018
            • 20276
            • UK

            #6
            Re: HDMI switch handshake issues?

            Are you using a DisplayPort to HDMI cable ,or an an active adapter .
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

            Comment

            • spleenharvester
              Badcaps Veteran
              • Mar 2010
              • 882
              • UK

              #7
              Re: HDMI switch handshake issues?

              Interestingly enough I am using a DP to HDMI adapter yeah - no HDMI ports on this PC annoyingly.
              Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: HDMI switch handshake issues?

                It looks like your box has the same issue as STARTECH product:
                https://www.startech.com/faq/mst-hubs-sleep-issue
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • spleenharvester
                  Badcaps Veteran
                  • Mar 2010
                  • 882
                  • UK

                  #9
                  Re: HDMI switch handshake issues?

                  That would make a lot of sense, but unfortunately setting to HDMI doesn't fix the issue for me. Killing the power to both devices seems to be the only way to get it working again.
                  Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

                  Comment

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