On 2025-10-29, Martin <[email protected]> wrote: > First time some tests have been performed with OpenBSD 7.7 + Iridium and > Chromium browsers with connected NanoKVM USB (USB camera + audio + uhid input > device emulation) composite device. > > The same machine (OpenBSD 7.7 and 7.8 after upgrade) hosts nginx server with > web page to access NanoKVM USB. > > By opening a link http://nanokvm.local in Iridium or Chromium browser on the > same machine resolves and opens NanoKVM access page with drop down menu which > asks to access camera and microphone device. Once permissions are granted > "Select USB device" drop down menu has appeared with "USB3 Video" and "Select > Serial Device" button to access NanoKVM USB video from remote PC where > NanoKVM is connected. > > Once "Select Serial Device" button is pressed on the nanokvm.local web page, > Iridium and Chromium browsers crash with core dump.
No idea if it will help but you could try building a kernel with a quirk added to prevent the hid interface from attaching to uhid so that it falls back to ugen. See UQ_BAD_HID in usb_quirks.c. Seems the serial port device is attached behind the HID presumably so browsers can get access to it with webhid-like mechanisms (as also used for fido keys etc) rather than webusb. I guess you may need to disable some pledge/ unveil too. Generally OpenBSD is not the right OS for accessing random USB hardware from userland. FWIW I used to take a usb hdmi capture stick (and small keyboard) for this use-case (iirc I used vlc or ffplay with our v4l2 compat) but gave up on it and got a jetkvm instead which I'm pretty happy with. Much easier to handle via network than USB.
