After I upgraded to 16.04 LTS, I could not use my DisplayLinks graphics/ethernet adapter for graphics (ethernet works fine). I recently installed the newest driver (1.2.65) but I get this error:

Warning: dlm.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Job for dlm.service failed because the control process exited with error code. See "systemctl status dlm.service" and "journalctl -xe" for details.

I run journalctl as suggested by the error message and here is what I get:

26 16:27:28 myhost systemd[1]: Starting DisplayLink Manager Service...
-- Subject: Unit dlm.service has begun start-up
-- Defined-By: systemd

-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

-- Unit dlm.service has begun starting up.
26 16:27:28 myhost modprobe[12034]: modprobe: ERROR: could not insert 'evdi': Required key not available
26 16:27:28 myhost systemd[1]: dlm.service: Control process exited, code=exited status=1
26 16:27:28 myhost systemd[1]: Failed to start DisplayLink Manager Service.
-- Subject: Unit dlm.service has failed
-- Defined-By: systemd

-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

-- Unit dlm.service has failed.

-- The result is failed.
26 16:27:28 myhost systemd[1]: dlm.service: Unit entered failed state.
26 16:27:28 myhost systemd[1]: dlm.service: Failed with result 'exit-code'.

Any ideas?

As someone who uses a dedicated GPU in alternation with the Integrated GPU. It is BEYOND frustrating when my Nvidia GPU will not switch on because of the DisplayLink driver software. There is no option in windows itself to turn it off, and there is nothing provided by DisplayLink either.

It cripples productivity when I have to UNINSTALL the DL driver just to use my dedicated GPU.

Please fix this before you guys release any additional updates as this has been going on for a LONG time now.

I love my AOC usb monitor. It's great, only after I install the drivers just to use it temporarily, and then uninstall them afterwards because I know it will conflict with anything i try to do there after. Be it gaming, video encoding, etc.

I love your product, but we've got to get this fixed.

I have had a problem with your displaylink products for months now, it's causing my entire OS to hand. It seems I'm not the only one, I found the below forum post showing multiple people have the same issue.
http://www.displaylink.org/forum/showthread.php?t=63963

I've tried cleanups, reinstalling the latest drivers and all I could think of. The only way I can get the system to stop crashing is if I always reboot my PC right after I disconnect display link each and every time which is ridiculous. I wouldn't buy a laptop if I wanted to reboot 5 times a day.

There is post saying this would be fixed in the next driver release in the first half of October. Since the first half of October 2015 has passed may I ask which year?

Mac OS X and Windows 7 Pro work around for USB Monitor(s) (SIIG USB 2.0 to VGA Pro) Corruption – Vertical Black Bars

Using:

OS X 10.10.5 (Windows 7 Pro, see additional comments below)
DisplayLink USB Graphics Software for Mac OS X Version 2.4
SIIG.com - USB 2.0 to VGA Pro
3 HP Monitors (Model: HP S2031) (one connected via HDMI to DVI Adapter, one connected via Mini DisplayPort to DVI Adapter, and one connected via SIIG.com – USB 2.0 to VGA Pro

Issue:

Corruption on the left and right sides of attached USB monitor (black vertical bars on left and right side of USB monitor). Aspect ratio on USB monitor does not appear correct as a result of the aforementioned black bars. Entire monitor not being used on USB connected device due to black vertical bars.

Solution (Concise):

Step 1: Install version 2.4
Step 2: Uninstall version 2.4
Step 3: Install version 2.1

Solution (Detailed):

Step 1: Disconnect USB monitor(s) from your computer.

Step 2: Uninstall the version of DisplayLink USB Graphics Software for Mac OS X Version x.x that is currently installed on your computer. Then restart your computer, when instructed via the on screen prompt, in order to complete the uninstall process. If you do not have DisplayLink USB Graphics Software for Mac OS X installed on your computer proceed to the next step.

Step 3: Download and install DisplayLink USB Graphics Software for Mac OS X Version 2.4. Then restart your computer, when instructed via the on screen prompt, in order to complete the install process.

Step 4: Uninstall DisplayLink USB Graphics Software for Mac OS X Version 2.4. Then restart your computer, when instructed via the on screen prompt, in order to complete the uninstall process.

Step 5: Download and install DisplayLink USB Graphics Software for Mac OS X Version 2.1. Then restart your computer, when instructed via the on screen prompt, in order to complete the install process.

Step 6: Connect USB monitor(s) and aforementioned issue is resolved.

Additional Comments:

I used these steps on a Mac Mini Late 2012 and a MacBook Pro Early 2015 and they worked on both. I know the DisplayLink website states that Version 2.1 is not compatible with OS X 10.10.5 but for some reason if you install 2.4, uninstall 2.4, and install 2.1 it works.

I even went as far as reformatting both computers and tried installing version 2.1 first and the USB monitor did not work. Then I uninstalled 2.1, installed 2.4, uninstalled 2.4, and reinstalled 2.1 and it solved all of my issues.

I am not sure how or why these steps worked but I performed them and I am 4 for 4 on it working.

I wonder if during the uninstall process some files are left from version 2.4 that version 2.1 leverages?

I hope you find this solution helpful, if yes please vote for it. If you have any questions please leave comments and I will do my best to respond. FYI this is the only DisplayLink device I use so if you have questions on other devices or software I will not be able to assist.

Windows 7 Pro users: I have had the same issues with the vertical black bars on the USB monitor(s) when using the most recent versions of DisplayLink USB Graphics Software for Windows. I have found that installing an older version of the software (Version 7.6 M2, no longer available on DisplayLink’s website) resolves the monitor issues. You should be able to follow the steps mentioned above for Mac but instead use the Windows version on a Windows computer!