Port Failed to Open or "Busy"

LightBurn Hardware Compatibility GRBL
1

Hi, using lightburn with the elegoo Phecda I always get one of these problems:

“Port failed to open - already in use?”

or

the laser sits at “Busy 100%” above the pause/stop buttons

The laser works fine with LaserGRBL so things like a faulty cable etc can be ruled out

Any ideas?

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2

Are you disconnecting from lasergrbl and any other programs using the port?

3

yes, doesn’t work after restarting the computer, or before laserGRBL was even installed unfortunately

4

What version of Lightburn are you using? Beta version 1.4.04 says * Bugfix: Fixed serial disconnect issue (“port already in use?” bug)

5

Thanks for responding, I was on 1.4.03, I just installed 1.4.04 and its the same issue :frowning:

6

It is possible you have solved it! seems to work right now after updating to that beta build and restarting

7

anyone coming after me, this eventually solved my problem:

Windows USB Issues - LightBurn Software Documentation

  • Open the Control Panel.
  • Find Power Options.
  • Click on Change Power Plan/Settings.
  • Click Advanced Power Settings.
  • Find USB Settings - disable both boxes here.
  • Save and close.
  • Go to Device Manager (Right-click My Computer. Select Manage | Device Manager.)
  • Find the first listed USB Root Hub.
  • Double-click and go to the Power Management tab.
  • Uncheck both boxes here.
  • Repeat for each additional USB Root Hub.
  • Reboot when all are completed.
1 Like
8

You’re on a desktop computer?

9

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