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Old 07-23-2020, 05:50 PM   #1
Chuck
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Default DisplayLink stopped working on 18.04

Came in today and my 2 Display Link Monitors are not working.
Dock: plugable ULTC4k (USB-C 4K)
uname -a:
Code:
xxxxxxx 5.4.0-42-generic #46~18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
What I've tried:
connecting/disconnecting monitors and USB-C cable; cycling power on dock station; re-installing drivers (5.2.14).
Error on reinstalling:
Code:
ERROR (code 3): Failed to build evdi/5.2.14. Consult /var/lib/dkms/evdi/5.2.14/build/make.log for details..
The above-mentioned log has the following:

Code:
DKMS make.log for evdi-5.2.14 for kernel 5.4.0-42-generic (x86_64)
Thu Jul 23 13:39:02 EDT 2020
make KBUILD_VERBOSE=1 SUBDIRS=/var/lib/dkms/evdi/5.2.14/build SRCROOT=/var/lib/dkms/evdi/5.2.14/build CONFIG_MODULE_SIG= -C /lib/modules/5.4.0-42-generic/build modules
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-42-generic'
make -f ./Makefile syncconfig
make -f ./scripts/Makefile.build obj=scripts/basic
rm -f .tmp_quiet_recordmcount
make -f ./scripts/Makefile.build obj=scripts/kconfig syncconfig
  flex -oscripts/kconfig/lexer.lex.c -L scripts/kconfig/lexer.l
/bin/sh: 1: flex: not found
scripts/Makefile.host:9: recipe for target 'scripts/kconfig/lexer.lex.c' failed
make[3]: *** [scripts/kconfig/lexer.lex.c] Error 127
make[3]: *** Waiting for unfinished jobs....
  bison -o scripts/kconfig/parser.tab.c --defines=scripts/kconfig/parser.tab.h -t -l scripts/kconfig/parser.y
/bin/sh: 1: bison: not found
scripts/Makefile.host:17: recipe for target 'scripts/kconfig/parser.tab.h' failed
make[3]: *** [scripts/kconfig/parser.tab.h] Error 127
Makefile:594: recipe for target 'syncconfig' failed
make[2]: *** [syncconfig] Error 2
Makefile:704: recipe for target 'include/config/auto.conf.cmd' failed
make[1]: *** [include/config/auto.conf.cmd] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-42-generic'
Makefile:22: recipe for target 'all' failed
make: *** [all] Error 2
Also ran lsusb -d 17e9:
lsusb -d 17e9:
Code:
Bus 004 Device 004: ID 17e9:6012 DisplayLink
I'm attaching logs from troubleshooting tool as well.
Attached Files
File Type: zip DLSupportTool_Output_2020-07-23T13:48:54.125929.zip (70.1 KB, 2 views)

Last edited by Chuck; 07-23-2020 at 06:36 PM. Reason: Provide additional details
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Old 07-24-2020, 01:36 AM   #2
Chrismb
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Default

Exact same issue here.
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Old 07-24-2020, 09:54 AM   #3
StefanF
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Default

Same issue here with driver version 5.3.1.34.
Reinstalling the driver does not help.
With previous kernel the system is working properly.
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Old 07-24-2020, 09:57 AM   #4
mabu
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Default Same issue after a kernel upgrade

I have the same issue after a kernel upgrade from 5.3.0-59-generic to 5.4.0-42-generic.
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Old 07-24-2020, 11:04 AM   #5
mabu
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Default Downgrade kernel as a temp solution

I had to downgrade to the previous kernel to get my second monitor working again.
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Old 07-24-2020, 12:10 PM   #6
Chrismb
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Default

In case anyone runs into the same issue I did whereby switching to 5.3.0-X kernel brought up the monitors ok but made it run super slow. Turning the laptop monitor on solved the issue per

https://bugs.launchpad.net/ubuntu/+b...15/comments/12

A superwide monitor is starting to look good on days like today!

Last edited by Chrismb; 07-24-2020 at 01:33 PM.
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Old 07-31-2020, 12:36 PM   #7
Chuck
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Default Any Update/ETA on fix for 5.0.42 kernel?

I'm not seeing any movement on this, should I be reporting to another channel (git, etc.)?
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Old 08-06-2020, 09:53 AM   #8
KatarzynaKowalczyk
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Default

Hello,

Please make sure that you are not missing the tools necessary for the installation.
You have to run following command prior to installing the newest driver:

Code:
sudo apt install build-essential dkms
You can also check the following article: https://support.displaylink.com/know...on-ubuntu-20-0

Please give that a try and let me know if it helped.

Best regards,
Katarzyna
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Old 08-07-2020, 10:58 AM   #9
StefanF
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Quote:
Originally Posted by KatarzynaKowalczyk View Post
Hello,

Please make sure that you are not missing the tools necessary for the installation.
You have to run following command prior to installing the newest driver:

Code:
sudo apt install build-essential dkms
You can also check the following article: https://support.displaylink.com/know...on-ubuntu-20-0

Please give that a try and let me know if it helped.

Best regards,
Katarzyna

Hello,

i have both packages installed and the driver version 5.3.1 is installed and working properly together with the older kernel 5.3.0-62.
It stopped working with the delivery of the newest ubuntu 18.04 kernel version 5.4.0-42.

I tried again to uninstall der displaylink driver. Reboot with the newest kernel. Install all updates. Ensure that build-essential and dkms is installed and tried again to install the displaylink driver as described in article 1944022-how-to-install-displaylink-software-on-ubuntu-20-0 with the same result.
If i switch back to the older kernel it directly start working again.

It seems to be that the driver is incompatible with the actual ubuntu 18.04 kernel.

BR
Stefan
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Old 08-10-2020, 08:15 AM   #10
kce
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Default Stopped working, ubuntu 18.04 dell d6000

I get the same issue as the people above.
Came into the office and everything worked, but after installation off all pending updates there is no picture on the two connected monitors.
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