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. |
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' 2. Patch evdi-1.7.0 with #228 or clone directly Code:
tar xf v1.7.0.tar.gz or Code:
git clone https://github.com/DisplayLink/evdi.git evdi-1.7.0 3. Replace evdi Code:
rm displaylink-driver-5.3.1.34/evdi.tar.gz Code:
cd displaylink-driver-5.3.1.34 The patch has been sucessfully tested on Archlinux and openSUSE. |
Hi,
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Thanks a lot. |
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 :confused:
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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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. |
Ok thanks for that follow up clarification - if I get a chance I will have a go.
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DisplayPort not working
1 Attachment(s)
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 Code:
|18:59:24|crashdummy@pop-os:[~]> lsmod | grep evdi 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:
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Hello, Following the patch steps work on Ubuntu 20.10 with distro's default kernel (5.8.0-26-generic) |
Bnavigator
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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... |
Just wanted to say thanks for the detailed steps to get things working on 5.9.X as I finally did these today :cool:
With kernel 5.10 nearly here will this workaround continue to also work for 5.10 :confused: |
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