Using the gl kvm with external 8-port KVM not quite functional

KVM
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Hi team! First of all, thank you for releasing an amazing product. It was quick and easy to set up. however I'm having a problem with an external KVM switcher.

When I connect to the KVM to the "K/M" ports for Keyboard mouse input, the KVM seems to only act on the hotkey sequence (control - control - #) to switch inputs. That works fine. However, it is not passing keys to devices. If I connect to the USB 2.0 ports, the keys are sent fine, but this bypasses the KVM, sending directly to the selected device.

Previously I was (or back to using for now) a PilotKVM device which worked perfectly fine but had issues sometimes engaging in HDMi signals. Rebooting it would usually fix the problem.

The KVM I speak of is this one:

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Also, some more information here from screen shot. you can see that a regular keyboard+mouse works. BTW I am using a USB hub for easier debugging unplug/replug. Screenshots & system log attached. Using 1.4.0 beta1.
system_logs_20250812_020348.zip (41.6 KB)

image
image833×696 143 KB

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Thanks for your reaching.
Currently, our KVM device supports controlling only one device at a time.
Multi-device control has not been designed or tested in our current system.
We do have plans for it, though we cannot confirm its availability in the near future

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Oh bummer. I see. So the TinyPilot KVM seems to work fine (based on Pi 4) and is somehow sending the correct signals. maybe I'll show you the screenshot for that in case it helps.

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Hi @Kyrie , After some more research I found something on pikvm github:
Hardware KVM doesn't recognise keyboard hotkey switching from pikvm · Issue #7 · pikvm/pikvm

Once I disabled msd via override.yaml, the KVM detects the device correctly as a keyboard mouse! I guess it was detecting as a mass-storage device.

But of course then I can't mount virtual media!

Perhaps there is a workaround that anyone can think of?

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More details here in case anyone is interested... Mass Storage Drive - PiKVM Handbook

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Some devices block USB mass storage (MSD) functionality within KVM-emulated composite devices.
It can be solved by disabling MSD, so in this device MSD and KB/Mouse cannot be enable at the same time.

1 Like
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I'm also facing this issue.
I hope it will be resolved in the future.

PiKVM works fine through the KVM switch.
But GL-RM1's appearance and functionality are smarter than PiKVM and I wanted to replace it.

If there is room for improvement, I would be happy to cooperate with the investigation.