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#1 2019-11-14 16:44:16

rohitpaulk
Member
Registered: 2019-11-14
Posts: 2

[SOLVED] DisplayLink monitor completely black, only mouse visible

I was following the guide in https://wiki.archlinux.org/index.php/DisplayLink to setup an external monitor through a DisplayLink USB 3.0 dock connector.

Everything seems to have worked exactly like the documentation described, but here's the weird part:

My screen is black with small 'blacker' stripes in the middle. I can move the cursor to the screen, view and move it around (with almost zero lag), but that's pretty much all I can do.

Image:

https://i.imgur.com/8YCAZTB.jpg

System details:

  • Window Manager: i3

  • Display Dock: Dell D3100

  • pacman up-to-date

  • Macbook Air, previous generation. One Mini DisplayPort, two USB 3.0 ports

Here's what I tried:

  • Turning off compton

  • Switched monitors, only the one connected to the DisplayLink dock exhibits problems.

  • Switched ports on the DisplayLink hub

  • Toggled resolution from 1920x1080 all the way down to 640x480.

  • - On most resolutions the screen is black with stripes

  • - On some it is a heavily jumbled up version of what my screen should look like. (The overall colour matches my wallpaper)

  • - On some it is plain black, no stripes

  • Installed DisplayLink drivers on MacOS, and they worked fine (so can't be a problem with the hardware)

Here's what I've got left to try:

  • I installed `evdi`, not `evdi-git` as suggested in the docs (ran into a repo not found error with the latter). evdi is pretty up-to-date though, there's only 1 commit that is present on evdi-git and not on evdi.

  • I haven't tried switching the modeline

Given that I can see the cursor movement just fine, seems unlikely that any of the above would fix it though... (still going to try, thought that posting here early might help)

Mod edit: Converted oversized image: https://wiki.archlinux.org/index.php/Co … s_and_code -- V1del

Last edited by rohitpaulk (2019-12-10 05:19:16)

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#2 2019-11-15 13:08:00

chico
Member
From: Sweden
Registered: 2011-03-06
Posts: 16
Website

Re: [SOLVED] DisplayLink monitor completely black, only mouse visible

What is the graphics chip on your computer?
I have similar problem with the intel driver sice xf86-video-intel-1:2.99.917+870+g6f4972d5-1
If the chip is Intel, try a downgrade.
wrote a post in this forum a few weeks ago with refering links.
https://bbs.archlinux.org/viewtopic.php?id=250258

Hope that works

--UPDATE--
decided to try out a few other tricks.
Temporarily disabling PageFlip for modesetting did work.
according to the documentation you should create the file:
/usr/share/X11/xorg.conf.d/20-displaylink.conf
I do like my systems clean so I made the file in the /etc tree instead:
/etc/X11/xorg.conf.d/20-displaylink.conf
added the contents:

------------------------------------------------
Section "Device"
  Identifier "DisplayLink"
  Driver "modesetting"
  Option "PageFlip" "false"
EndSection
--------------------------------------------
Do try that out as well, spares you from using outdated drivers.

Last edited by chico (2019-11-15 13:30:49)

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#3 2019-12-10 05:20:04

rohitpaulk
Member
Registered: 2019-11-14
Posts: 2

Re: [SOLVED] DisplayLink monitor completely black, only mouse visible

Disabling PageFlip worked. Thanks!

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