Very low performance with AMD Ryzen Pro 4750U
 

I bought a Club Dual 4k Dock (Displaylink):

I got to notebooks, one for work, one for private, both running Ubuntu 20.10
The first got a Intel® Core™ i7-10710U Processor and the dock works well.
The second got a AMD Ryzen Pro 4750U and the performance of the external sceens is very low.

Moving windows redraw that slow that it looks like wobbling, parts of the window are moved others aren't. Mouse cursor feels a bit more fluid, but far from usable.

Same Issue
 

I got exactly the same issue. Processor is a AMD Ryzen 4800H with integrated graphics (no dedicated graphic card).

When I connect a monitor directly to my Laptops HDMI Output, everything is great.

Via the docking station its basically unusable, even Youtube Videos have a lot of fragmentation going on while playing. It seems like the signal is separated into several horizontal blocks and they get updated one after the other with a noticable delay between each block.

same here. performance is really bad. basically this stuff is unusable.

Same here
 

Hey,
Sorry to write it, but same here.
Tried on Ubuntu 20.04 and 20.10.
Drivers version tried 5.3.1.34 and 5.4.0-55.153.
Laptop:

• Processor: AMD® Ryzen 5 pro 4650u with radeon graphics × 12
• Graphics: AMD® Renoir

System:

• Gnome Version: 3.38.3
• Kernel: Linux 5.8.0-50-generic x86_64
• OS: Ubuntu 20.10

All works good, until I plug in docking station. Then system seems to behave like drunk old man. I get out of nowhere latency between click and run program, each window is fragmenting once moving, unusable, not able to work on that :(
as I recall on Ubuntu 18.04 and 18.10 it was ok. So I suspect drivers.

Do you think this can be connected with issue described here :confused:

Hello,

We're all in the same boat.
I have shared my device details Here

Why my situation is explained Here

I hope DisplayLink can atleast make use of GPU for Linux users.

Looking forward for a fix.

Manjaro Team.

Same here
 

I have to same problem under Ryzen 5 3500u. The fix with the amdgpu drivers doesnt work here because the Radeon Vega Mobile Gfx is not supported. I had a problem with grafic glitches. Please fix these problems.

Are there any updates? Did your problems get fixed meanwhile?

Not for me. After digging thru tons of posts and googling for another day and waiting for any official response in this thread for a while, I gave up eventually and returned the docking station. Even if there is some way to fix it, I'm not buying a 200 Euro Docking Station in order to waste several days to set it up.

Are there any updates for AMD only machines?

Updates
 

Waiting, waiting for ages now... any updates?

@Displaylink you could take at least an opinion or position to that topic and not just ignoring this bunch of poor users.

How about treating your users with some dignity?

PIng... any updates here?

Having exactly the same problem. Ubuntu 20.04.2 LTS, latest drivers installed, AMD Ryzen 3. Laptop works perfectly until I plug into the dock station, then it really slows down, everything jittering. DisplayLinkManager shows as running well over 100% CPU (between 130 and 180) if I do anything on the connected monitors. Been like this for about a year now, it's completely unusable. I've seen so many other posts on here with the same issue, unfortunately just being completely ignored!! :mad::mad:

So... are there any plans to support AMD Ryzen ever?

If you own a notebook with an USB-C adaptor, you should better take a look at the USB-C specification, especially if it supports USB DP 1.2 or newer. In this case you might try to look for a MST Hub/Docking station instead of using the USB way.
For MST-DockingStation you should not need any additional driver, because it is a USB-DP feature, so there should not be any reason to rely on display-link anymore.

This is STILL a problem. Clearly DisplayLink aren't bothered about this, however it seems to be affecting a lot of people. I'm more than happy to work with support etc to provide diagnostics to get this fixed.


PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3903 root 20 0 2295932 77432 11560 S 136.7 1.3 4:26.26 DisplayLinkMana

Was facing the same issue on a 3700U with Vega 8
Was able to get it working smoothly on Arch using a patch
https://github.com/pioto1225/evdi/tree/amd_vmap_texture

Installed evdi-amd-vmap-texture from the AUR and edited /etc/modprobe/evdi.conf like mentioned on the GitHub to get it working

Hope this helps

This also worked perfectly for me, It's a bit of a headache because it's lost when you update the kernel so you have to go through resigning the .ko file etc. However once it's done, it works perfectly.