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pikvm/docs/edid.md
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EDID

!!! note This will only apply to the CSI models include V3+, USB capture is not compatable. Modifing the EDID may or may not work in some instances where a "no signal" might be a result of outside factors.

EDID is information about the video modes supported by the video capture device. In the case of PiKVM, this is an HDMI CSI bridge. Usually, you don't need to change this, since the default configuration is quite flexible, but sometimes, for example for strange UEFIs/BIOSes, this may be necessary (the story).

The EDID is stored on the PiKVM in the file /etc/kvmd/tc358743-edid.hex. If you write new data there, it will be applied after rebooting.

You can also apply the new EDID without rebooting to make sure it works:

  • Switch filesystem to RW-mode: rw.
  • Create the new EDID file /root/edid.hex (examples of file contents are shown below).
  • Apply EDID using the command kvmd-edidconf --edid=/root/edid.hex --apply.
  • DO NOT REBOOT the PiKVM. Just your PC. Check the UEFI/BIOS or the OS.
  • If everything is working, you can make this config permanent: kvmd-edidconf --import=/root/edid.hex. This command will write the EDID to /etc/kvmd/tc358743-edid.hex in a pretty format.
  • Switch filesystem to RO-mode: ro.

Default EDID

If for some reason you need to go back to the default EDID (changing attached device etc), you can find it locally on the Pi at /usr/share/kvmd/configs.default/kvmd/edid or in the kvmd repo.

EDID examples for V4+

PiKVM can mimic physical monitors. You can find the appropriate EDID in this database and import its HEX code to PiKVM. Choose something with a maximum resolution of 1920x1080 or 1920x1200.

??? example "Acer B246WL, 1920x1200, with audio" Taken here, as described above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

??? example "ASUS PA248QV, 1920x1200, with audio" Taken here, as described above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

??? example "DELL D2721H to avoid black screen on some HDMI splitters, 1920x1080, no audio" Taken here, as described above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

EDID examples for V2+

Copy the contents into a file, for example /root/edid.hex, then follow the same steps as above.

??? example "1280x1024 as preferred. Useful for Gigabyte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

??? example "1920x1080 as preferred. Useful for Gigabyte GA-H77-DS3H, Intel NUC or ASRock H670 PG Riptide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

??? example "1280x1024 as preferred, disabled 1080p at all. This may be necessary in extremely rare cases if the BIOS is completely buggy. In the future, we will provide a way to dynamically switch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

Editing EDID

To edit the EDID, it is best to use third-party utilities, such as the recommended advanced AW EDID Editor for Windows (it's working great in wine) or wxEDID. Both editors work with the binary EDID format, but you can easily import and export it to PiKVM using the kvmd-edidconf utility.

So, to tune EDID on PiKVM, use the following steps:

  1. Switch filesystem to RW-mode: rw.

  2. Export the system edid to the binary file myedid.bin:

    # kvmd-edidconf --export-bin=/root/myedid.bin

  3. Copy this file to your PC with the editor. Use SCP, Putty or something like that. Open this binary file in the editor and change the necessary parameters. Edit, save and copy it back to PiKVM.

  4. Convert the binary file to the HEX and test it:

    # kvmd-edidconf --import=/root/myedid.bin --edid=/root/myedid.hex --apply

  5. If everything works fine, install the new EDID file into the system:

    # cp /root/myedid.hex /etc/kvmd/tc358743-edid.hex

  6. Alternative to step (4) and (5): if you are confident in your abilities, you can immediately install the new myedit.bin into the system and apply it instantly, without the need to use the temporary myedid.hex:

    # kvmd-edidconf --import=/root/myedid.bin --apply

  7. Switch filesystem to RO-mode: ro.

The kvmd-edidconfig utility has the ability to change some simple parameters without using an external editor. For example you can change the vendor, model name and enable HDMI audio on the PiKVM virtual display:

# kvmd-edidconf --set-mfc-id=LNX --set-monitor-name=PiKVM --set-audio=1
# reboot

!!! note Windows cache's drivers and registry settings so changing the monitor name is not enough, you will also need to change the product ID and/or the serial number along with the monitor name: # kvmd-edidconf --set-monitor-name=TOSHIBA --set-mfc-id=TTP --set-product-id=34953 --set-serial=2290649089 --apply