Monitor connected to MacBook Pro with HDMI repeated disconnects on wake up

The MacBook and monitor behave impeccably during use. But, when I finish using them I have tried pulling out the usb connection and I have tried powering off the docking station once I have closed the lid - to remove the power supply to the MacBook.

Either way, when I reconnect the power the MacBook detects the monitor and reconnects. But, it then disconnects. This is repeated a variable number of times. Eventually, it decides to reconnect and all is well.

So I have yet to figure out how put the MacBook to sleep and then wake it without watching this process.

Total power off or restart of the MacBook is fine, it is just shutting the lid and removing power that causes an issue.

Hi Andy,

Thanks for reaching out to Plugable support! I’d be happy to help with that.

For clarification, when you say that you are removing power, is that the power supply for the UD-CAM docking station or the MacBook?

Thank you,

Richard A
Plugable Technologies
https://plugable.com/support

I mean I click the on/off button on the docking station. By doing that I am assuming I am removing power to the MacBook.

Hi Andy,

Thanks for the update.

The power button on the UD-CAM should shut down the docking station, but we may want to try something a bit more drastic.

Resetting the docking station is a good step to take if one or more portions of the dock aren’t functioning:

  1. Disconnect docking station from host machine and power adapter
  2. Leave unplugged for 1 minute for power to dissipate
  3. Connect docking station initially into power only and confirm white indicator light is on
  4. Connect docking station to host machine using USB-C cable and test for functionality
  5. If the above steps do not change the behavior, rebooting the host system may restore functionality

Thank you for giving us a chance to help!

Richard A
Plugable Technologies
https://plugable.com/support

Thanks for the suggestions.

  1. Are you saying it is important to physically disconnect the docking station from power, rather than simply pressing the off button?

If so, that is actually a pain in the rear the way my gear is set up.

  1. Your steps (3) and (4) are useful and I will try to make sure I use that sequence to see what happens.

Rebooting definitely clears up the behaviour, but is not really what am looking for. The idea is that I can close the lid on the MacBook and when I reopen the lid I can start working really quickly.

Hi Andy,

Thanks for the update.

The type of reset steps that I provided are not intended as a thing that you should do regularly but they do tend to fix issues that you may run into.

Are you having more luck with the setup that you want after the reset?

Thank you,

Richard A
Plugable Technologies
https://plugable.com/support

Tried it.
Made no difference.

Hi Andy,

Thank you for the detail you provided and the testing you have performed that is much appreciated.

Based on your description of the behavior, our next step is to get some additional information.

Please keep the dock connected to your system (even though not working) and send the output of our diagnostic utility PlugDebug → http://plugable.com/support/plugdebug to us directly via support@plugable.com with ‘For Ticket 358400’ in the subject line. This will allow us match things up and examine some log files from your system to help determine the next steps.

Please also include your Amazon Order ID number for the docking station purchase in your direct email. Please do not post the Order ID or the PlugDebug file in our public forum.

Thank you for giving us the chance to help!

Richard A
Plugable Technologies
https://plugable.com/support

Hi Richard,

I will try and get some logs but TBH it doesn’t end up failing. It is just that I have to wait for it to cycle through 3-4 connect/disconnect sequences with the monitor. It always ends up ok.

Hi Andy,

Thanks for the update.

That is not the typical expected outcome from using the UD-CAM but to look further into this issue we would want to have a look into log files to see what could be creating issues.

Thank you,

Richard A
Plugable Technologies
https://plugable.com/support

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