Green lines on screen when using Wi-Fi
- @david
- AAther @ather
I have the green lines issue when using the C790 HDMI board over WiFi.
When I connect it using ethernet cable it works perfectly.
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.
- AAther @ather
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 ?
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
andssid
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.