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Green lines on screen when using Wi-Fi

By David @david2025-03-13 15:25:03.759Zassigned to
  • @david

  • 4 replies
  1. A
    Ather @ather
      2025-03-13 11:07:10.987Z

      I have the green lines issue when using the C790 HDMI board over WiFi.

      When I connect it using ethernet cable it works perfectly.

      1. David @david2025-03-13 15:28:04.897Z

        Hi @ather, I'm sorry you're running into this display issue when using Wi-Fi.

        I've moved your comment to its own post so we can discuss it as a standalone issue.

        Are you seeing this issue on a device you built yourself? And can I confirm that you're referring to this HDMI capture device?

        Please let me know if you have any questions.

        1. AAther @ather
            2025-03-13 20:46:38.600Z

            Yes, I did build one using RPi 4 and Geekworm C790.

            I also have Geekworm X630 with the X1300 A2 I2S board and didn't face any issue with that board.

            I don't understand, could it be due to Wi-Fi interference ?

            1. David @david2025-03-17 12:50:44.260Z

              Thanks for confirming, @ather.

              I don't understand, could it be due to Wi-Fi interference ?

              I'm not sure - nobody has reported this behavior before. But I can't think of any other possible explanations right now.

              Can you reproduce the green line behavior and then share the output of a few commands to see if there's any information that might help with troubleshooting here?

              SSH into your device and then run the following command:

              iw wlan0 info
              

              The output from the command should look something like this (feel free to remove the addr and ssid values):

              Interface wlan0
                  ifindex 3
                  wdev 0x1
                  addr [removed]
                  ssid [removed]
                  type managed
                  wiphy 0
                  channel 52 (5260 MHz), width: 80 MHz, center1: 5290 MHz
                  txpower 31.00 dBm
              

              Then could you run the following command:

              iwlist wlan0 channel
              

              The output should look something like this:

              wlan0     32 channels in total; available frequencies :
                        Channel 01 : 2.412 GHz
                        Channel 02 : 2.417 GHz
                        Channel 03 : 2.422 GHz
                        Channel 04 : 2.427 GHz
                        Channel 05 : 2.432 GHz
                        Channel 06 : 2.437 GHz
                        Channel 07 : 2.442 GHz
                        Channel 08 : 2.447 GHz
                        Channel 09 : 2.452 GHz
                        Channel 10 : 2.457 GHz
                        Channel 11 : 2.462 GHz
                        Channel 12 : 2.467 GHz
                        Channel 13 : 2.472 GHz
                        Channel 34 : 5.17 GHz
                        Channel 36 : 5.18 GHz
                        Channel 38 : 5.19 GHz
                        Channel 40 : 5.2 GHz
                        Channel 42 : 5.21 GHz
                        Channel 44 : 5.22 GHz
                        Channel 46 : 5.23 GHz
                        Channel 48 : 5.24 GHz
                        Channel 52 : 5.26 GHz
                        Channel 56 : 5.28 GHz
                        Channel 60 : 5.3 GHz
                        Channel 64 : 5.32 GHz
                        Channel 100 : 5.5 GHz
                        Channel 104 : 5.52 GHz
                        Channel 108 : 5.54 GHz
                        Channel 112 : 5.56 GHz
                        Channel 116 : 5.58 GHz
                        Channel 120 : 5.6 GHz
                        Channel 124 : 5.62 GHz
                        Current Frequency=5.26 GHz (Channel 52)
              

              That information should help me understand a little more about the Wi-Fi configuration here and may help with troubleshooting. Perhaps we'll need to change the frequency your TinyPilot's Wi-Fi uses.

              Please let me know if you have any questions.