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93 lines
3.7 KiB
Markdown
93 lines
3.7 KiB
Markdown
# EDID
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EDID is information about the video modes supported by the video capture device.
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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,
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but sometimes, for example for strange UEFIs/BIOSes, this may be necessary (the [story](https://github.com/pikvm/pikvm/issues/78)).
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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.
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You can also apply the new EDID without rebooting to make sure it works:
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* Switch filesystem to RW-mode: `rw`.
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* Create file with EDID `/root/edid.hex` (examples of file contents are shown below).
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* Apply EDID using the command `v4l2-ctl --device=/dev/kvmd-video --set-edid=file=/root/edid.hex --fix-edid-checksums`.
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* DO NOT REBOOT the PiKVM. Just your PC. Check the UEFI/BIOS.
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* If everything works, you can write the same data to `/etc/kvmd/tc358743-edid.hex`.
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* Switch filesystem to RO-mode: `ro`.
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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).
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## Custom EDIDs
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??? example "1280x1024 as preferred. Useful for Gigabyte GA-H77-DS3H"
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```
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00FFFFFFFFFFFF005262888800888888
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1C150103800000780AEE91A3544C9926
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0F505425400001000100010001000100
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010001010101D51B0050500019400820
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B80080001000001EEC2C80A070381A40
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3020350040442100001E000000FC0050
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492D4B564D20566964656F0A000000FD
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00323D0F2E0F0000000000000000014D
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02030400DE0D20A03058122030203400
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F0B400000018E01500A0400016303020
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3400000000000018B41400A050D01120
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3020350080D810000018AB22A0A05084
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1A3030203600B00E1100001800000000
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00000000000000000000000000000000
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00000000000000000000000000000000
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00000000000000000000000000000045
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```
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??? example "1920x1080 as preferred. Useful for Gigabyte GA-H77-DS3H or Intel NUC"
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```
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00FFFFFFFFFFFF005262888800888888
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1C150103800000780AEE91A3544C9926
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0F505425400001000100010001000100
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010001010101D32C80A070381A403020
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350040442100001E7E1D00A050001940
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3020370080001000001E000000FC0050
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492D4B564D20566964656F0A000000FD
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00323D0F2E0F000000000000000001C4
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02030400DE0D20A03058122030203400
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F0B400000018E01500A0400016303020
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3400000000000018B41400A050D01120
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3020350080D810000018AB22A0A05084
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1A3030203600B00E1100001800000000
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00000000000000000000000000000000
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00000000000000000000000000000000
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00000000000000000000000000000045
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```
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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 EDID"
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```
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00FFFFFFFFFFFF005262888800888888
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1C150103800000780AEE91A3544C9926
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0F50542FCF0001000100010001000100
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0100010101018C2300A050001E403020
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370080001000001E000000FC0050492D
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4B564D20566964656F0A000000FD0032
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3D0F2E0F000000000000000000000010
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0000000000000000000000000000016B
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02030400DE0D20A03058122030203400
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F0B400000018E01500A0400016303020
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3400000000000018B41400A050D01120
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3020350080D810000018AB22A0A05084
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1A3030203600B00E1100001800000000
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00000000000000000000000000000000
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00000000000000000000000000000000
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00000000000000000000000000000045
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```
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## Default EDID
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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`:
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```
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# cp /usr/share/kvmd/configs.default/kvmd/tc358743-edid.hex /etc/kvmd/tc358743-edid.hex
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```
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... or in the [kvmd repo](https://github.com/pikvm/kvmd/blob/master/configs/kvmd/tc358743-edid.hex).
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