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USB not working #457

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opened 2026-02-20 08:22:53 -05:00 by deekerman · 7 comments

deekerman commented

2026-02-20 08:22:53 -05:00

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Originally created by @dnlweijers on GitHub (Nov 15, 2025).

I just received my JetKVM. Everything works except usb connection. I tried multiple ports, cables, cable orientations even, switching power and usb poort etc, removing the splitter and only from device to kvm, nothing works. Firmware is the latest. I use it with a Intel NUC Kit NUC8i3BEH. Does anyone know what to do???

Originally created by @dnlweijers on GitHub (Nov 15, 2025). I just received my JetKVM. Everything works except usb connection. I tried multiple ports, cables, cable orientations even, switching power and usb poort etc, removing the splitter and only from device to kvm, nothing works. Firmware is the latest. I use it with a Intel NUC Kit NUC8i3BEH. Does anyone know what to do???

deekerman added the

component: usb

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2026-02-20 08:22:53 -05:00

deekerman commented

2026-02-20 08:22:53 -05:00

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@dnlweijers commented on GitHub (Nov 15, 2025):

I tried power from socket, power from router usb port, multiple usb ports on host

@dnlweijers commented on GitHub (Nov 15, 2025): I tried power from socket, power from router usb port, multiple usb ports on host

deekerman commented

2026-02-20 08:22:53 -05:00

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@jdranchman commented on GitHub (Nov 15, 2025):

Ditto. I'm trying to connect to a UGREEN NAS and the USB just doesn't connect whatever I've tried. Video is up but no USB connection for kbd/mouse.

@jdranchman commented on GitHub (Nov 15, 2025): Ditto. I'm trying to connect to a UGREEN NAS and the USB just doesn't connect whatever I've tried. Video is up but no USB connection for kbd/mouse.

deekerman commented

2026-02-20 08:22:53 -05:00

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@ym commented on GitHub (Nov 17, 2025):

Could you confirm whether you have a DC extension connected?
Also, please provide the following outputs to help with the investigation:

cat /sys/kernel/debug/usb/ffb00000.usb/mode
cat /sys/kernel/debug/usb/ffb00000.usb/link_state
cat /sys/kernel/debug/usb/ffb00000.usb/testmode
cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_status
cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/control

@ym commented on GitHub (Nov 17, 2025): Could you confirm whether you have a DC extension connected? Also, please provide the following outputs to help with the investigation: ``` cat /sys/kernel/debug/usb/ffb00000.usb/mode cat /sys/kernel/debug/usb/ffb00000.usb/link_state cat /sys/kernel/debug/usb/ffb00000.usb/testmode cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_status cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/control ```

deekerman commented

2026-02-20 08:22:53 -05:00

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@dnlweijers commented on GitHub (Nov 17, 2025):

Could you confirm whether you have a DC extension connected? Also, please provide the following outputs to help with the investigation:
cat /sys/kernel/debug/usb/ffb00000.usb/mode
cat /sys/kernel/debug/usb/ffb00000.usb/link_state
cat /sys/kernel/debug/usb/ffb00000.usb/testmode
cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_status
cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/control

I don't have any extentions.
I believe the plobem is in the hardware, it also doesn't work on my new, high-end Windows laptop, again, only visuals, no keyboard and mouse.

As of the commands:

# cat /sys/kernel/debug/usb/ffb00000.usb/mode
t /sys/kernel/debug/usb/ffb00000.usb/testmode
cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_statdevice
# cat /sys/kernel/debug/usb/ffb00000.usb/link_state
On
# cat /sys/kernel/debug/usb/ffb00000.usb/testmode
no test
# cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_status
active
# cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/control
on
#

@dnlweijers commented on GitHub (Nov 17, 2025): > Could you confirm whether you have a DC extension connected? Also, please provide the following outputs to help with the investigation: > > ``` > cat /sys/kernel/debug/usb/ffb00000.usb/mode > cat /sys/kernel/debug/usb/ffb00000.usb/link_state > cat /sys/kernel/debug/usb/ffb00000.usb/testmode > cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_status > cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/control > ``` I don't have any extentions. I believe the plobem is in the hardware, it also doesn't work on my new, high-end Windows laptop, again, only visuals, no keyboard and mouse. As of the commands: ``` # cat /sys/kernel/debug/usb/ffb00000.usb/mode t /sys/kernel/debug/usb/ffb00000.usb/testmode cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_statdevice # cat /sys/kernel/debug/usb/ffb00000.usb/link_state On # cat /sys/kernel/debug/usb/ffb00000.usb/testmode no test # cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/runtime_status active # cat /sys/bus/platform/drivers/dwc3/ffb00000.usb/power/control on # ```

deekerman commented

2026-02-20 08:22:54 -05:00

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@jdranchman commented on GitHub (Nov 18, 2025):

When trying to use external power, the usb does not connect - ever - no matter what I try. Connecting using usb power from the UGREEN then it connects ok with usb emulation off.

Let me add - my use case is using a UI bridge and using usb power via splitter to power the kvm. This is nice but I can't get the usb to connect when the kvm is always powered on. To me this is manditory as I can't count on the controlled device to have power available.

@jdranchman commented on GitHub (Nov 18, 2025): When trying to use external power, the usb does not connect - ever - no matter what I try. Connecting using usb power from the UGREEN then it connects ok with usb emulation off. Let me add - my use case is using a UI bridge and using usb power via splitter to power the kvm. This is nice but I can't get the usb to connect when the kvm is always powered on. To me this is manditory as I can't count on the controlled device to have power available.

deekerman commented

2026-02-20 08:22:54 -05:00

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@dnlweijers commented on GitHub (Nov 18, 2025):

When trying to use external power, the usb does not connect - ever - no matter what I try. Connecting using usb power from the UGREEN then it connects ok with usb emulation off.

Let me add - my use case is using a UI bridge and using usb power via splitter to power the kvm. This is nice but I can't get the usb to connect when the kvm is always powered on. To me this is manditory as I can't count on the controlled device to have power available.

Thanks for the awsner, only, I dont really understand, could you explain it more easily?

@dnlweijers commented on GitHub (Nov 18, 2025): > When trying to use external power, the usb does not connect - ever - no matter what I try. Connecting using usb power from the UGREEN then it connects ok with usb emulation off. > > Let me add - my use case is using a UI bridge and using usb power via splitter to power the kvm. This is nice but I can't get the usb to connect when the kvm is always powered on. To me this is manditory as I can't count on the controlled device to have power available. Thanks for the awsner, only, I dont really understand, could you explain it more easily?

deekerman commented

2026-02-20 08:22:54 -05:00

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@jdranchman commented on GitHub (Nov 18, 2025):

Maybe I should open another issue. I thought my experience was the same as the OP but maybe not.

https://github.com/jetkvm/kvm/issues/979

@jdranchman commented on GitHub (Nov 18, 2025): Maybe I should open another issue. I thought my experience was the same as the OP but maybe not. [https://github.com/jetkvm/kvm/issues/979](url)