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Old 10-12-2020, 09:46 AM   #1
andy_g
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Default Linux 5.9 and Display Link

Hi all

As per my earlier post here about getting Display Link drivers working on (K)Ubuntu 20.04 I have also been having no issues on the later 5.8.13 and 5.8.14 kernels but when updating to test the 5.9 kernel this morning I get nothing. Display Link doesn't even seem to start as I can't find the process running.

I haven't tried manually running the Display Link process etc yet as I have work to do but wanted to give others a heads up that it's probably best to stick on the >5.8.8 Kernels for now but if anyone has any tips or things for me to try on 5.9 later I'm happy to try.
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Old 10-19-2020, 11:55 PM   #2
bnavigator
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Default You have to patch the kernel module

Hello Ubuntu Users,

DisplayLink can work with the newest kernel 5.9, but you have to patch the kernel module manually.
The issue is discussed here: https://github.com/DisplayLink/evdi/issues/225


Get:
1. Unzip the DisplayLink package and extract the inner archive

Code:
unzip 'DisplayLink USB Graphics Software for Ubuntu 5.3.1.zip'
chmod +x displaylink-driver-5.3.1.34.run
./displaylink-driver-5.3.1.34.run --noexec --keep

2. Patch evdi-1.7.0 with #228 or clone directly

Code:
tar xf v1.7.0.tar.gz
pushd evdi-1.7.0
patch -p1 < ../228.patch
popd

or

Code:
git clone https://github.com/DisplayLink/evdi.git evdi-1.7.0
pushd evdi-1.7.0
git fetch origin pull/228/head
git checkout -b pr228 FETCH_HEAD
popd

3. Replace evdi

Code:
rm displaylink-driver-5.3.1.34/evdi.tar.gz
pushd evdi-1.7.0
tar cf evdi.tar.gz *
cp evdi.tar.gz ../displaylink-driver-5.3.1.34/
popd
4. Install displaylink

Code:
cd displaylink-driver-5.3.1.34
sudo ./displaylink-installer.sh install
However, we did not get feedback from any reasonably skilled Ubuntu user that these instructions are complete for Ubuntu.

The patch has been sucessfully tested on Archlinux and openSUSE.
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Old 10-20-2020, 08:19 AM   #3
alha
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Default

Hi,

Quote:
Originally Posted by bnavigator View Post
However, we did not get feedback from any reasonably skilled Ubuntu user that these instructions are complete for Ubuntu.
I just tested this and can confirm it to be working on Linux Mint 20 (Ubuntu 20.04 base) w/ Kernel 5.9.1.

Thanks a lot.
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Old 10-20-2020, 08:43 AM   #4
andy_g
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Default

Thanks for posting those instructions and I might try later but for now I'm just dropping back down to 5.8.X when I'm using DisplayLink as I'm worried, (as per some on that original thread) that this 5.9 patch will break 5.8.X

5.9 seems stable and I haven't hit any issues so far but haven't got hours to debug at the moment so might just stick on 5.8 until things are a bit more complete.
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Old 10-20-2020, 01:04 PM   #5
bnavigator
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Default

Quote:
Originally Posted by andy_g View Post
(as per some on that original thread) that this 5.9 patch will break 5.8.X
No need to worry in this regard. The voiced concerns in the original thread do have no factual grounds. If you look into the patch you will see all the modifications are wrapped in preprocessor macros to discriminate between kernel versions as it is already the case for API changes in previous kernels.

The way the evdi kernel module works: For every installed kernel version, DKMS compiles and installs a kernel module against the correct kernel headers.

You can switch between installed kernels and its respective kernel modules in your bootloader menu.
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Old 10-20-2020, 01:45 PM   #6
andy_g
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Default

Ok thanks for that follow up clarification - if I get a chance I will have a go.
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Old 11-04-2020, 06:26 PM   #7
Crashdummy
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Join Date: Nov 2020
Posts: 3
Default DisplayPort not working

Hello there,

I hope this is still the valid topic for my question.

I am able to install the displaylink driver quite fine, however the Monitors connected thorugh Displayports refuse to work with this kernel.

I did a clean install of Pop OS 20.10.

Code:
|19:07:02|crashdummy@pop-os:[~]> uname -a && lsb_release -a
Linux pop-os 5.9.3-surface #1 SMP Wed Nov 4 03:03:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
No LSB modules are available.
Distributor ID:	Pop
Description:	Pop!_OS 20.10
Release:	20.10
Codename:	groovy
Code:
|18:59:24|crashdummy@pop-os:[~]> lsmod | grep evdi
evdi                   53248  4
drm_kms_helper        221184  2 evdi,i915
syscopyarea            16384  2 drm_kms_helper,evdi
sysfillrect            16384  2 drm_kms_helper,evdi
sysimgblt              16384  2 drm_kms_helper,evdi
drm                   544768  14 drm_kms_helper,evdi,i915

|18:59:25|crashdummy@pop-os:[~]> sudo dkms status
[sudo] password for crashdummy: 
evdi, 1.7.0, 5.9.3-surface, x86_64: installed
system76, 1.0.9~1597073326~20.10~5b01933, 5.8.0-7625-generic, x86_64: installed
system76, 1.0.9~1597073326~20.10~5b01933, 5.9.1-surface, x86_64: installed
system76, 1.0.9~1597073326~20.10~5b01933, 5.9.3-surface, x86_64: installed
system76_acpi, 1.0.2~1600812457~20.10~0bc966c, 5.8.0-7625-generic, x86_64: installed (original_module exists)
system76_acpi, 1.0.2~1600812457~20.10~0bc966c, 5.9.1-surface, x86_64: installed (original_module exists)
system76_acpi, 1.0.2~1600812457~20.10~0bc966c, 5.9.3-surface, x86_64: installed (original_module exists)
system76-io, 1.0.1~1559663713~20.10~ea5f61a, 5.8.0-7625-generic, x86_64: installed
system76-io, 1.0.1~1559663713~20.10~ea5f61a, 5.9.1-surface, x86_64: installed
system76-io, 1.0.1~1559663713~20.10~ea5f61a, 5.9.3-surface, x86_64: installed

|18:59:36|crashdummy@pop-os:[~]> xrandr --listmonitors
Monitors: 2
 0: +XWAYLAND0 2736/260x1824/170+2560+239  XWAYLAND0
 1: +XWAYLAND1 2560/700x1440/400+0+0  XWAYLAND1
I am using This Dock from i-tec

I did all these steps as instructed.
The only way the monitors can produce some output is by connecting them with HDMI.
As this dock has only one HDMI Port I can't work around this issue for now...

I use This Lenovo USB-C Dock frequently, too.
The Displays here are connect with displayports only, thus no display can be connected at all.

Both dockings were working quite fine till Kernel 5.7 ( haven't tested since then )

Logs have been attached

Update: Restarting the displaylink service appears to get the second monitor to run:

Code:
|12:44:33|crashdummy@pop-os:[~]> sudo systemctl restart displaylink-driver
|12:44:33|crashdummy@pop-os:[~]> systemctl status displaylink-driver 
● displaylink-driver.service - DisplayLink Driver Service
     Loaded: loaded (/lib/systemd/system/displaylink-driver.service; static)
     Active: active (running) since Sat 2020-11-28 12:44:26 CET; 37s ago
    Process: 19260 ExecStartPre=/bin/sh -c modprobe evdi || (dkms install $(ls -t /usr/src | grep evdi | head -n1  | sed -e "s:-:/:") && modprobe evdi) (code=exited, status=0/SUCCESS)
   Main PID: 19262 (DisplayLinkMana)
      Tasks: 48 (limit: 8913)
     Memory: 73.9M
     CGroup: /system.slice/displaylink-driver.service
             └─19262 /opt/displaylink/DisplayLinkManager

Nov 28 12:44:26 pop-os systemd[1]: Starting DisplayLink Driver Service...
Nov 28 12:44:26 pop-os systemd[1]: Started DisplayLink Driver Service.
Attached Files
File Type: zip DLSupportTool_Output_2020-11-04T19:25:53.255962.zip (64.9 KB, 0 views)

Last edited by Crashdummy; Yesterday at 11:49 AM.
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Old 11-09-2020, 06:19 AM   #8
abutaha
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Join Date: Nov 2020
Posts: 2
Default

Quote:
Originally Posted by bnavigator View Post
Hello Ubuntu Users,

DisplayLink can work with the newest kernel 5.9, but you have to patch the kernel module manually.
The issue is discussed here: https://github.com/DisplayLink/evdi/issues/225


Get:
1. Unzip the DisplayLink package and extract the inner archive

Code:
unzip 'DisplayLink USB Graphics Software for Ubuntu 5.3.1.zip'
chmod +x displaylink-driver-5.3.1.34.run
./displaylink-driver-5.3.1.34.run --noexec --keep

2. Patch evdi-1.7.0 with #228 or clone directly

Code:
tar xf v1.7.0.tar.gz
pushd evdi-1.7.0
patch -p1 < ../228.patch
popd

or

Code:
git clone https://github.com/DisplayLink/evdi.git evdi-1.7.0
pushd evdi-1.7.0
git fetch origin pull/228/head
git checkout -b pr228 FETCH_HEAD
popd

3. Replace evdi

Code:
rm displaylink-driver-5.3.1.34/evdi.tar.gz
pushd evdi-1.7.0
tar cf evdi.tar.gz *
cp evdi.tar.gz ../displaylink-driver-5.3.1.34/
popd
4. Install displaylink

Code:
cd displaylink-driver-5.3.1.34
sudo ./displaylink-installer.sh install
However, we did not get feedback from any reasonably skilled Ubuntu user that these instructions are complete for Ubuntu.

The patch has been sucessfully tested on Archlinux and openSUSE.


Hello,

Following the patch steps work on Ubuntu 20.10 with distro's default kernel (5.8.0-26-generic)
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Old 11-22-2020, 02:35 AM   #9
RobstaRobotard
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Join Date: Mar 2020
Posts: 3
Default Bnavigator

Quote:
Originally Posted by abutaha View Post
Hello,

Following the patch steps work on Ubuntu 20.10 with distro's default kernel (5.8.0-26-generic)
Yes, Abutaha, this was working fantastically for me as well in 5.8... But there are issues with 5.9 as mentioned, which could be addressed more thoroughly by any reasonable maintenance guy as highlighted in the linked post that has brought us all here

Since we're all here and not mentioning names. I mean, that would be unreasonable... Perhaps we can collectively be more conducive and indicate which DisplayLink build we're running, which kernel version, and which EVDI version too... If we can indicate what works and what doesn't too?

For me I've tried the instructions above on 5.9 under Ubuntu 20.10 (which also worked on 5.8.*) prior and have offered logs as well...
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