↓ Skip to main content
Background Image
  1. Posts/

[Tutorial] How to fix glitchy or wrong BIOS/UEFI resolution for PiKVM

·320 words·2 mins

This tutorial is mostly for my reference in case for when I forget how to fix this issue in the future. But I will try to be as beginner friendly as much as possible.

If you are seeing glitchy or wrong BIOS/UEFI resolution in your PiKVM session (I am actually using the BliKVM HAT), like the following screenshot, follow the steps below the picture!

glitchy or wrong BIOS/UEFI resolution

  1. First, if you haven’t tried the official troubleshooting steps, you should try that. Here is the link to that, and scroll down to the “Glitchy or wrong BIOS/UEFI resolution” section in that page. However, those steps didn’t work for me. Fortunately, I have figured out a way to fix this!
  2. After you log on to your PiKVM session, select “Terminal”.
  3. Run su-, and enter in your password.
  4. Run rw to enter Read-Write mode.
  5. Run nano /etc/kvmd/tc358743-edid.hex to edit the tc358743-edid.hex config file that contains information about the video modes supported by the video capture device.
  6. Replace the content in the file with the following. For transparency’s sake, this is an EDID (Extended Display Identification Data) for a 1920x1080 display, and it is taken from here. 
    00FFFFFFFFFFFF005262888800888888
1C150103800000780AEE91A3544C9926
0F505425400001000100010001000100
010001010101D32C80A070381A403020
350040442100001E7E1D00A050001940
3020370080001000001E000000FC0050
492D4B564D20566964656F0A000000FD
00323D0F2E0F000000000000000001C4
02030400DE0D20A03058122030203400
F0B400000018E01500A0400016303020
3400000000000018B41400A050D01120
3020350080D810000018AB22A0A05084
1A3030203600B00E1100001800000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000045
  7. Save the file by pressing Ctrl and X at the same time, type y, and press Enter.
  8. Run kvmd-edidconf --apply to apply the changes.
  9. Run ro to switch to Read-Only mode.
  10. Check the stream to check whether your BIOS/UEFI is displayed correctly in PiKVM. If not, restart the host, not the device running PiKVM. Hopefully your BIOS/UEFI is finally being displayed correct on your PiKVM like the following screenshot. If not, you can always undo these changes and restore the default EDID by running the commands below the screenshot.
    correct BIOS/UEFI resolution 
rw
kvmd-edidconf --import-preset=v1 --apply # for PiKVM v1
ro

You can change the v1 to v0, v1, v2, v3, v4mini and v4plus depending on your hardware.