[Bug 1875015] Re: Ubuntu 20.04 and Displaylink is extremely slow

[Luca Capra]

Hi, I am on 21.10 with intel driver and latest displaylink from their
website. Everything used to work decently until a couple of day ago when
I started seeing the external monitor very slow. I was on 21.04 and
after  an update it has started being slow.

1. It is slower when more things change on the screen, only the mouse works slow a full screen rendering is unusably slow.
2. on the login screen the screen works very well, as I was used to.
3. Audio work fine, rendering is very slow

About my pc

1. Linux vin 5.13.0-20-generic #20-Ubuntu SMP Fri Oct 15 14:21:35 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
2. Driver from display link displaylink-driver-5.4.1-55.174
3. Tried X11 and Wayland from GDM with Gnome

I tried to troubleshoot as described here
https://wiki.archlinux.org/title/DisplayLink and setting
LIBGL_DRI3_DISABLE=true as said here but it does not change

Any hint is appreciated! 
Thank you

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https://bugs.launchpad.net/bugs/1875015

Title:
  Ubuntu 20.04 and Displaylink is extremely slow

Status in Nouveau Xorg driver:
  Unknown
Status in OEM Priority Project:
  New
Status in X.Org X server:
  Unknown
Status in nvidia-graphics-drivers-470 package in Ubuntu:
  Confirmed
Status in xorg-server package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  In Progress
Status in xserver-xorg-video-nouveau package in Ubuntu:
  In Progress
Status in xorg-server source package in Focal:
  In Progress
Status in xorg-server source package in Hirsute:
  In Progress
Status in xorg-server source package in Impish:
  Fix Released

Bug description:
  Using ubuntu 20.04 on displaylink docking with external monitor is
  totally slow, unusable. The GUI responds very slow, if you click, the
  command of the click goes on after about 3 seconds... if you type, all
  the letters are with the same lag, so it is totally unusable.

  Was using displaylink without any problem on 19.10 until yesterday, when I upgraded to 20.04. 
  It is terrific.

  If i plug out the usb for the displaylink docking station, than the
  speed is back, and the system is ok, if I connect it to the docking
  station again, everything extremely slow again.

  Please investigate this asap, as it is unusable on displaylink docking
  stations.

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