Lightburn was working perfectly with my Lenovo/Windows10 machine and my Atomstack A5 laser engraver. However. when I moved to an HP Zbook (also Windows10), I found that Lightburn was unable to find the engraver. The laser discovery window remained blank, and when I manually defined a device with the appropriate Grbl parameters and tried to print a pattern, I received a message saying that Lightburn could not find my laser device.
Comparing the Lenovo and ZBook device listings, I found that on the Lenovo the laser device was defined as “CH340 Com4” while the Zbook identified a USB Serial Port with an unknown driver. More significantly, the Zbook device manager did not show any Com ports.
I installed a CH340 driver on the Zbook (there are multiple download sites available in the internet) and restarted the Zbook. The device manager now showed a Com port, and Lightburn located and initialized my laser engraver immediately, and I had no further operational problems.
But I did want to share my experience, since possibly the most recent generation of laptops are being shipped without a Com port driver. Lightburn requires a logical Com port.