# EDID

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](https://github.com/pikvm/pikvm/issues/78)).

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 on the PiKVM reboot.

You can also apply the new EDID without rebooting to make sure it works:
* Switch filesystem to RW-mode: `rw`.
* Create file with EDID `/root/edid.hex` (examples of file contents are shown below).
* Apply EDID using the command `v4l2-ctl --device=/dev/kvmd-video --set-edid=file=/root/edid.hex --fix-edid-checksums`.
* DO NOT REBOOT the PiKVM. Just your PC. Check the UEFI/BIOS.
* If everything works, you can write the same data to `/etc/kvmd/tc358743-edid.hex`.
* Switch filesystem to RO-mode: `ro`.

The examples below are tested on these devices, but they are also suitable for others. To edit or create EDID you can use [AW EDID Editor](https://www.analogway.com/emea/products/software-tools/aw-edid-editor).

### 1280x1024 as preferred resolution, Gigabyte GA-H77-DS3H
`00 FF FF FF FF FF FF 00 52 62 88 88 00 88 88 88 1C 15 01 03 80 00 00 78 0A EE 91 A3 54 4C 99 26 0F 50 54 25 40 00 01 00 01 00 01 00 01 00 01 00 01 00 01 01 01 01 D5 1B 00 50 50 00 19 40 08 20 B8 00 80 00 10 00 00 1E EC 2C 80 A0 70 38 1A 40 30 20 35 00 40 44 21 00 00 1E 00 00 00 FC 00 50 49 2D 4B 56 4D 20 56 69 64 65 6F 0A 00 00 00 FD 00 32 3D 0F 2E 0F 00 00 00 00 00 00 00 00 01 4D 02 03 04 00 DE 0D 20 A0 30 58 12 20 30 20 34 00 F0 B4 00 00 00 18 E0 15 00 A0 40 00 16 30 30 20 34 00 00 00 00 00 00 18 B4 14 00 A0 50 D0 11 20 30 20 35 00 80 D8 10 00 00 18 AB 22 A0 A0 50 84 1A 30 30 20 36 00 B0 0E 11 00 00 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 45`

### 1920x1080 as preferred resolution, Gigabyte GA-H77-DS3H, Intel NUC
`00 FF FF FF FF FF FF 00 52 62 88 88 00 88 88 88 1C 15 01 03 80 00 00 78 0A EE 91 A3 54 4C 99 26 0F 50 54 25 40 00 01 00 01 00 01 00 01 00 01 00 01 00 01 01 01 01 D3 2C 80 A0 70 38 1A 40 30 20 35 00 40 44 21 00 00 1E 7E 1D 00 A0 50 00 19 40 30 20 37 00 80 00 10 00 00 1E 00 00 00 FC 00 50 49 2D 4B 56 4D 20 56 69 64 65 6F 0A 00 00 00 FD 00 32 3D 0F 2E 0F 00 00 00 00 00 00 00 00 01 C4 02 03 04 00 DE 0D 20 A0 30 58 12 20 30 20 34 00 F0 B4 00 00 00 18 E0 15 00 A0 40 00 16 30 30 20 34 00 00 00 00 00 00 18 B4 14 00 A0 50 D0 11 20 30 20 35 00 80 D8 10 00 00 18 AB 22 A0 A0 50 84 1A 30 30 20 36 00 B0 0E 11 00 00 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 45`

# 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/tc358743-edid.hex` (`cp /usr/share/kvmd/configs.default/kvmd/tc358743-edid.hex /etc/kvmd/tc358743-edid.hex`) or in the [kvmd repo](https://github.com/pikvm/kvmd/blob/master/configs/kvmd/tc358743-edid.hex).