System doesn't boot with JetKVM connected #367

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opened 2026-02-20 08:22:15 -05:00 by deekerman · 4 comments

deekerman commented

2026-02-20 08:22:15 -05:00

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Originally created by @Heronimos on GitHub (Jul 13, 2025).

I’m using a JetKVM to control a headless laptop (screen broken) that serves as a Proxmox server. Here’s the issue:

Works after boot: If I connect the JetKVM after the laptop is already powered on, it functions perfectly.

Fails to boot: When the JetKVM is connected during startup, the laptop won’t boot (no POST, no BIOS screen).

BIOS settings tried:

    Toggled USB legacy support (enabled/disabled)

    Verified boot order (no conflicts)

    Tested other relevant BIOS options

External display works: With a physical monitor attached, the laptop boots normally, and I can access the BIOS.

Connection attempts:

    USB 2.0/3.0 ports

    USB-C via Y-cable

    USB through a PD hub
    → Same result: No boot if JetKVM is connected at startup.

Question: Any suggestions to fix this? Is this a BIOS limitation, KVM quirk, or something else?

Originally created by @Heronimos on GitHub (Jul 13, 2025). I’m using a JetKVM to control a headless laptop (screen broken) that serves as a Proxmox server. Here’s the issue: Works after boot: If I connect the JetKVM after the laptop is already powered on, it functions perfectly. Fails to boot: When the JetKVM is connected during startup, the laptop won’t boot (no POST, no BIOS screen). BIOS settings tried: Toggled USB legacy support (enabled/disabled) Verified boot order (no conflicts) Tested other relevant BIOS options External display works: With a physical monitor attached, the laptop boots normally, and I can access the BIOS. Connection attempts: USB 2.0/3.0 ports USB-C via Y-cable USB through a PD hub → Same result: No boot if JetKVM is connected at startup. Question: Any suggestions to fix this? Is this a BIOS limitation, KVM quirk, or something else?

deekerman added the

component: usb

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2026-02-20 08:22:15 -05:00

deekerman commented

2026-02-20 08:22:16 -05:00

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@orepvik commented on GitHub (Jul 25, 2025):

Is this a HP laptop?

@orepvik commented on GitHub (Jul 25, 2025): Is this a HP laptop?

deekerman commented

2026-02-20 08:22:16 -05:00

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@DrewDogComputers commented on GitHub (Sep 2, 2025):

I have the same issue, original firmware, updated latest, and dev firmware all have the same issue. This is an AM4 MSI board. Will not turn back on if rebooted or powered on with the data usb cable plugged in. Acts like it has no power until you remove the data usb cable, then boom, it boots immediately then. Tried every port on the board and every BIOS setting I could think of. Kind of defeats the purpose of the jetkvm when it cant power cycle with the jetkvm hooked up.

@DrewDogComputers commented on GitHub (Sep 2, 2025): I have the same issue, original firmware, updated latest, and dev firmware all have the same issue. This is an AM4 MSI board. Will not turn back on if rebooted or powered on with the data usb cable plugged in. Acts like it has no power until you remove the data usb cable, then boom, it boots immediately then. Tried every port on the board and every BIOS setting I could think of. Kind of defeats the purpose of the jetkvm when it cant power cycle with the jetkvm hooked up.

deekerman commented

2026-02-20 08:22:16 -05:00

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@DrewDogComputers commented on GitHub (Sep 2, 2025):

Removed the y-splitter and used the atx board to power the jetkvm, works fine now. Wish that bit of info wasn't hidden in a dark corner of some ancient discord server...

@DrewDogComputers commented on GitHub (Sep 2, 2025): Removed the y-splitter and used the atx board to power the jetkvm, works fine now. Wish that bit of info wasn't hidden in a dark corner of some ancient discord server...

deekerman commented

2026-02-20 08:22:16 -05:00

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@Solaris17 commented on GitHub (Sep 2, 2025):

Removed the y-splitter and used the atx board to power the jetkvm, works fine now. Wish that bit of info wasn't hidden in a dark corner of some ancient discord server...

Its here:

https://github.com/jetkvm/kvm/issues/23

and here

https://github.com/jetkvm/kvm/issues/50

@Solaris17 commented on GitHub (Sep 2, 2025): > Removed the y-splitter and used the atx board to power the jetkvm, works fine now. Wish that bit of info wasn't hidden in a dark corner of some ancient discord server... Its here: https://github.com/jetkvm/kvm/issues/23 and here https://github.com/jetkvm/kvm/issues/50