Display port doesn't worked for MacOS 10.15.4

[nessoft]

I've bought a Dell D6000 and try to connect with Macbook Pro (2017) with dual monitors. For HDMI port is worked just fine but for display port its kept say that "There's no signal from your computer". I've tried to swap on those two display port but it didn't worked.

Do you guys have any advise about this?

Software version:
- Display link version: 5.2.1
- D6000 firmware: latest


Monitors:
BenQ zowie XL2540: HDMI work fine, DP didn't worked
Dell U2415: HDMI work fine, DP didn't worked.


Thanks.

[nessoft]

I just attached the log files. Could you guys please help to take a look.

Steps:
1. Update firmware via windows.
2. Install display link 5.2.1 driver on MacOS Catalina 10.15.4
3. Restart.
4. Plugged dell D6000 dock to Macbook pro. 1 HDMI and 1 Display port for two displayed.
5. Only the monitor with HDMI is appeared. For the display port couldn't get signal.

[nessoft]

This issue have been resolved. I've found that this issue is about DisplayLinkManager extension can't be loaded. Here is is steps.

1. Uninstall your DisplayLink driver.
2. Restart, press and hold down Command + R keys immediately upon its redirect to Recovery mode.
3. Run the command csrutil disable
4. Restart your Mac, after the OS is loaded, run the command sudo kextcache -invalidate /
5. Install your DisplayLink driver.
6. Run the command in #4 once again.
7. Repeat step in #2
8. Run the command csrutil enable
9. Restart your, the DisplayLink extension should be loaded.

Hopefully, this would you guys who faced this issue.

[rbdlink]

Thanks @nessoft. Your solution worked for me.

My DisplayLink HDMI <> USB adapter works again for my MacBook Air running macOS 10.15.4. You should share this solution with other groups to try.

[commodore64]

Hi, guys.

I have OS X 10.15.4. My adaptor is a Lenovo DisplayLink AN9017D1. I have tried nessoft's suggestions with both drivers, 5.2.1 and Beta 0.5.

When I use 5.2.1, I can see that the DisplayLink kext is NOT blocked. I can see displaylinkmanager under Accessibility but it is not displayed under Screen Recording.

When I use the beta driver 0.5, I can see the app running at the top of my screen, but I still don't see it under Screen Recording.

My mac is an iMac (21.5-inch, Mid 2014). What else should I try? Thanks.

[KatarzynaCzaja]

Hello,

@commodore64, I've reached out to you over the email.
I would like to dicuss this case with you and make it easier to communicate.
I have contacted you directly via email, please lookout for an email from technical_enquiries@displaylink.com

Thank you,
Katarzyna