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Old 10-17-2020, 06:17 AM   #1
myersrj
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Default Ubuntu 20.04 Display Link with Ryzen (integrated graphics) SLOW refresh rate

Hi Jakub and DisplayLink team, I am hoping you can help provide some information.

As you are aware DisplayLink has a slow refresh rate on Ubuntu 20.04 making it unusable. You posted a link about this at https://www.displaylink.org/forum/sh...ad.php?t=67148 quoting:

"Please note: this patch is NOT applicable to AMD-only machines, for which we are currently developing a solution. We will update you when it is available."

It has been quite some time. Can you please provide an update on progress and possible timings (months, years?)

Is there a way I can keep up to date with the progress on this without needing to post? A link to a site where I can read the progress like on https://gitlab.freedesktop.org/xorg/.../-/issues/1028.

Please let us know
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Old 10-23-2020, 05:13 PM   #2
qnarkill
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same problem here, issue is on the external displays. Laptops display is fine.
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Old 10-26-2020, 05:48 AM   #3
spectrum
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I have same problem on Lenovo Thinkpad E495 (Ryzen 7 3700U)
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Old 10-29-2020, 07:38 AM   #4
myersrj
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Default Ubuntu 20.04 with Ryzen & integrated graphics working

Hi there

I have been able to run 20.04 without tearing by using the amdgpu-pro video drivers instead of the open source ones that come by default with Ubuntu.

Driver can be found here: "https://www.amd.com/en/support/kb/release-notes/rn-amdgpu-unified-linux-20-20"

Just extract to a directory and run the command "sudo amdgpu-pro-install -y" and then reboot.

Only thing to be aware of is if you try and use only the external monitor with your computer screen off you will get 3 sec delay on clicks.

To make it work perfectly make sure the screen of the computer your DisplayLink is plugged into is never off.

Hope this helps.

Last edited by myersrj; 10-29-2020 at 07:53 AM.
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Old 11-09-2020, 11:53 AM   #5
ozcho
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Default this worked!

Quote:
Originally Posted by myersrj View Post
Hi there

I have been able to run 20.04 without tearing by using the amdgpu-pro video drivers instead of the open source ones that come by default with Ubuntu.

Driver can be found here: "https://www.amd.com/en/support/kb/release-notes/rn-amdgpu-unified-linux-20-20"

Just extract to a directory and run the command "sudo amdgpu-pro-install -y" and then reboot.

Only thing to be aware of is if you try and use only the external monitor with your computer screen off you will get 3 sec delay on clicks.

To make it work perfectly make sure the screen of the computer your DisplayLink is plugged into is never off.

Hope this helps.
I've tried this solution and worked perfectly.

Thank you very much man!
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Old 11-11-2020, 07:35 PM   #6
fitter
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Hmm, I need to also thank you @myersrj
Ubuntu 20.04, kernel 5.4.0-53, CPU Ryzen 5 3500U, wayland here. I have now connected two Full-HD screens via the docking station. Everything works flawlessly, no audio glitches and CPU usage by displaylink stays between 5-20%, which is completely acceptable.

Interesting fact is that I actually tried AMD-distributed driver few weeks ago (the same version), but it was not working properly. Recently I disabled the "legacy boot" on my machine in order to fix different problem with black screen on boot. Seems like it played some role in fixing my problem.
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