USB HDMI 4k requires unplug/replug to be detected


#1

I already updated the drivers - but every time I turn on my TV, I have to unplug and replug in the USB HDMI 4k adapter for the TV to work as a secondary monitor. Any thoughts?


#2

Hi Kyle,

Thanks for posting. There are a lot of different variables that can affect the behavior when a display is powered off and on, so our first step is to get more information.

Can you provide more detail about the specific system and operating system you are using, the specific model of TV connected and the exact steps you are taking to reproduce the behavior?

Thank you,

Bob
Plugable Technologies
www.plugable.com/support


#3

Thank you for the reply, Bob.

I just updated to Windows 10.
TV is the Panasonic TC-65CX400U. 65" 4k TV
I purchased the USB>HDMI 4k Adapter.

I have updated the DisplayLink Drivers.
I also have the Intel Graphics 4000 graphic drivers - which I am led to believe is the problem.
When I view the properties of this GFX card it does not show 2 monitors detected (it has its own graphic display settings in addition to Windows10 standard settings) - However, windows DOES detect the TV, giving me the option to change resolutions, use as secondary monitor, ect.

I have tried removing the Pluggable HDMI adapter and Intel Graphics 4000 from Device Manager, and rebooting, but no luck.
They both reinstall and when I try to “Update Driver” they both are up to date.

I occasionally can get it to work by unplugging and replugging the USB in, but even that isn’t working now that I uninstalled the Intel Graphics 4000.

Any thoughts are greatly appreciated!

Thanks!


#4

Hi Kyle,

Thanks for getting back. The Intel software utility to manage displays will not be able to detect USB video adapters, so that it does not show the adapter’s presence is expected. You just need to use the Display Settings app built into Windows 10 for managing the displays.

Our adapter depends on the driver for your Intel graphics adapter to be installed in order to work, so the first step would be to ensure the latest driver for the Intel HD Graphics 4000 adapter is properly installed. Once verified, we’ll want to ensure the latest DisplayLink driver we recommend is in a good state by performing a ‘clean’ install. Please follow these steps:

  1. Disconnect the adapter from the system and please keep it disconnected until the last step.
  2. Uninstall the DisplayLink Core software from the Control Panel -> Programs and Features. Don’t worry if this fails, just move onto the next step
  3. Download, extract and run the DisplayLink cleaner tool, found here --> https://s3.amazonaws.com/plugable/bin… and ensure it displays “Cleaning Complete” when done (video walk-through if you need it -> https://youtu.be/AcVV1gD_FvI)
  4. Once the Cleaner has been run, reboot (even if not prompted to)
  5. Now download and install the 7.9 M7 DisplayLink software, found here --> https://s3.amazonaws.com/plugable/bin…
  6. Reattach the adapter to your system when prompted by the installer which will trigger the final portion of the installation. If the device is not detected, just click the ‘Skip’ button to allow the process to complete and reboot.

Once the adapter is working again, please let me know which specific model system you are using and the exact steps you are taking in terms of turning off the TV and/or system to replicate the behavior. Sorry if that is redundant, but I want to make sure I understand precisely the original scenario you describe.

Thank you,

Bob


#5

Thank you very much, Bob.

I completed all 6 steps.

Upon rebooting, the TV was detected and was a secondary monitor. Horray!

Except, when I cycle the TV off/on, it does not detect.

If I remove the USB and replug in, it does detect, and then we are okay.

Is there any solution to this? Why does it require a reconnect to ‘see’ the TV?

I am not sure what other details you may need that haven’t been given already - referring to your “specific model system” wordage.

Kyle


#6

Hi Kyle,

Thanks for getting back. I’m glad the adapter is working after the driver re-install.

Sorry if it wasn’t clear earlier, by ‘specific system’ I meant the brand and model of the PC or laptop you are using, and the details can matter in some cases.

When the adapter is connected and working if you are just cycling the power to the TV off, waiting a few moments, and then cycling the power to the TV back on, I would expect Windows to sense the removal of the display and ‘disconnect’ it from the system, and upon the TV being turned back on re-detect the display and re-enumerate it. This is contingent on the behavior of the TV itself and the host system. A quick test to isolate the behavior further would be to test temporarily with another HDMI display. Is that possible here?

Thank you,

Bob


#7

Ah, its a custom built PC I made a few years ago… P8Z77-V PREMIUM Motherboard.

https://www.asus.com/us/Motherboards/…

Not sure why I didnt think of this troubleshooting… but gave it a whirl…

I just plugged the 4k adapter into my other dual-monitor setup- turned off the monitor, turned it back on, and it worked just fine… did it a few times, too. Also tried swapping the HDMI cables to make sure that wasn’t the issue… Also appears to be fine.

So this leads me to believe something is wrong with the TV. Hmmm… Any thoughts?


#8

Also tried a different HDMI to connect to the TV. No luck.

There are some settings within the TV that I was tinkering with but no luck yet. Tried reading the TV Manual as well but no luck really…

ON TV:
Menu>Setup>System>Other Settings brings me to
HDMI EDID: (HDMI 2.0 or HDMI 1.4) tried both options…
HDMI LINK>
>> HDMI Link Control [ON/OFF]
>> Device Power Off [ON/OFF]
>> TV Power On [ON/OFF]
>> Audio Receiver [ON/OFF]
HDMI Link Device List> [empty]


#9

Now I tried HDMI direct to TV, power cycle, and it worked.


#10

Ok wow. I ended up trying a different pair of USB 3.0 ports on my desktop PC (front facing ones, instead of back of PC), and everything is working… Problem entirely solved!!! I have no clue why this is working, but it is!

I want to thank you very much for your patience, skill, and helping me think this through. This is actually my 5th Pluggable product, and I continue to return to you guys because of how helpful you guys are (and have been in the past). Is there any higher up I can email to let know what a good job you are doing? :slight_smile: Let me know. I think we are finished here, though!


#11

Hi Kyle,

Thanks so much for the kind words!  We try to have our whole team be the kind of people who love these products, use them everyday, and do our best to help.  We’re lucky to have great people like Bob on the team (check out some of his great help videos on our youtube channel!) 

If you wanted to give a shout-out in a way that will have the most impact, small companies like us rely on reviews. It’d be awesome to have your experiences captured there. Here’s a link to create a review for this one:
https://www.amazon.com/review/create-review/ref=cm_cr_dp_wrt_summary?ie=UTF8&asin=B00NQCFXGA&…#

Glad to have you up and running, thanks again!
Bernie Thompson
Founder, Plugable Technologies


#12

Hi Kyle,

Bernie already jumped in, but I would also like to say thank you very much both for the kind words and your great job in isolating the behavior.

As you have already discovered, even when a problem appears ‘simple’ there can always be a number of different variables that can affect the outcome so your approach, patience and attention to detail is much appreciated.

Please let us know if you need any help in the future, and thanks again!

Bob


#13