Viet, thank you for reporting this and helping make Ubuntu better.

Could you please provide the missing information from
https://help.ubuntu.com/community/DisplayLink#Reporting_bugs_when_using_the_latest_DisplayLink_driver
?

** Description changed:

- I am using one screen on my laptop, one connected via hdmi directly to my 
laptop and one via iTec usb 3 dockingstation. I have Nvidia proprietary drivers 
installed but switched to the open ones, as suggested in the workaround on this 
site (https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1278223). I followed 
the workaround and uninstalled displaylink drivers, rebooted, reinstalled them 
and rebooted. This worked nicely, but I wanted to use a sceen in portrait mode 
instead of landscape, so I rotated it and after this my cursor flickered and 
was followed by an werid rectangle, in which the screen doesnt update. So I 
tried reinstalling again but without success. I also tried the command xrand 
--auto, but without success. The rectangle stayed. I tried to deactivate my 
smallest screen, which was the integrated laptop screen, but the problem 
persisted. If i uninstalled die display link driver, reboot so that I only use 
the directly connected screen and my laptop screen, then everything worked 
properly with and without rotation.  Also after those driver un- and 
reinstalling the flickering would occur even without screen rotation (with 
display link driver installed).
- After some searching I stumbled upon 
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-384/+bug/1684240
 which suggested logging out and then in again, which solved my problem.
+ I am using the built-in laptop screen, one external monitor connected
+ directly to my laptop via HDMI, and one external monitor connect via a
+ i-tec USB 3.0 Docking Station.
  
- Now I can operate 3 monitors and one beeing rotated.
+ What happens is my mouse cursor flickers and is followed by an weird
+ rectangle, in which the screen doesn't update.
+ 
+ Deactivating my laptop screen didn't change anything.
+ 
+ This is not reproducible if I only use the laptop screen and HDMI
+ connected external monitor.
+ 
+ WORKAROUND: Log out and in again.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: xorg 1:7.7+19ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.25  Wed Jan 24 20:02:43 
PST 2018
   GCC version:  gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Feb 13 23:58:09 2018
  DistUpgraded: Fresh install
  DistroCodename: artful
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.13.0-31-generic, x86_64: installedError! Could not locate 
dkms.conf file.
   File:  does not exist.
  
   bbswitch, 0.8, 4.13.0-32-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics 
Controller [1025:071a]
   NVIDIA Corporation GK107M [GeForce GT 640M] [10de:0fd2] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: Acer Incorporated [ALI] GK107M [GeForce GT 640M] [1025:071b]
  InstallationDate: Installed on 2017-12-06 (69 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  MachineType: Acer Aspire M5-581TG
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed 
root=UUID=ac6372c5-a60f-47d5-8eab-91390b01a680 ro noplymouth
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/25/2013
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.11
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: MA51_HX
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.11
  dmi.modalias: 
dmi:bvnAcer:bvrV2.11:bd02/25/2013:svnAcer:pnAspireM5-581TG:pvrV2.11:rvnAcer:rnMA51_HX:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.11:
  dmi.product.family: Type1Family
  dmi.product.name: Aspire M5-581TG
  dmi.product.version: V2.11
  dmi.sys.vendor: Acer
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.83-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~17.10.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~17.10.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
  xserver.bootTime: Tue Feb 13 23:14:54 2018
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
  
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.5-0ubuntu2

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- mouse started to Flicker with 3rd monitor
+ Mouse icon flickers when connected to i-tec USB 3.0 Docking Station

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1749313

Title:
  Mouse icon flickers when connected to i-tec USB 3.0 Docking Station

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  I am using the built-in laptop screen, one external monitor connected
  directly to my laptop via HDMI, and one external monitor connect via a
  i-tec USB 3.0 Docking Station.

  What happens is my mouse cursor flickers and is followed by an weird
  rectangle, in which the screen doesn't update.

  Deactivating my laptop screen didn't change anything.

  This is not reproducible if I only use the laptop screen and HDMI
  connected external monitor.

  WORKAROUND: Log out and in again.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: xorg 1:7.7+19ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.25  Wed Jan 24 20:02:43 
PST 2018
   GCC version:  gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Feb 13 23:58:09 2018
  DistUpgraded: Fresh install
  DistroCodename: artful
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.13.0-31-generic, x86_64: installedError! Could not locate 
dkms.conf file.
   File:  does not exist.

   bbswitch, 0.8, 4.13.0-32-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics 
Controller [1025:071a]
   NVIDIA Corporation GK107M [GeForce GT 640M] [10de:0fd2] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: Acer Incorporated [ALI] GK107M [GeForce GT 640M] [1025:071b]
  InstallationDate: Installed on 2017-12-06 (69 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  MachineType: Acer Aspire M5-581TG
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed 
root=UUID=ac6372c5-a60f-47d5-8eab-91390b01a680 ro noplymouth
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/25/2013
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.11
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: MA51_HX
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.11
  dmi.modalias: 
dmi:bvnAcer:bvrV2.11:bd02/25/2013:svnAcer:pnAspireM5-581TG:pvrV2.11:rvnAcer:rnMA51_HX:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.11:
  dmi.product.family: Type1Family
  dmi.product.name: Aspire M5-581TG
  dmi.product.version: V2.11
  dmi.sys.vendor: Acer
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.83-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~17.10.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~17.10.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
  xserver.bootTime: Tue Feb 13 23:14:54 2018
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.5-0ubuntu2

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