Ubuntu 17.10下Wavlink WL-UG39DK1的DisplayLink驱动显示故障求助

Hey Jacob, I’ve tackled similar DisplayLink-related headaches on older Ubuntu versions before, so let’s work through some actionable steps to get your external display up and running:

1. Verify DisplayLink Driver is Loaded #

First, let’s confirm the core DisplayLink driver module (evdi) is actually active on your system. Open a terminal and run:

lsmod | grep evdi

If you see output listing the evdi module, great—your driver is loaded. If not, the installation likely didn’t complete properly. Uninstall the current driver first with:

displaylink-installer uninstall

Then re-run the installer, making sure to follow any prompts closely (you might need to enter your sudo password a few times).

2. Check for Unrecognized Displays #

Sometimes Ubuntu doesn’t automatically detect the DisplayLink-connected monitor. Let’s use command-line tools to check what’s being picked up:

• Run xrandr in the terminal. This will list all detected display outputs. Look for entries related to your external monitor (it might be labeled something like DP-1-1 or HDMI-1-1).
• If xrandr doesn’t show the monitor, try installing the arandr graphical display manager (it’s more detailed than the default system settings):

  sudo apt install arandr
  

  Launch it and see if it can detect the missing display.

3. Ensure Critical Dependencies Are Installed #

Older Ubuntu versions like 17.10 sometimes miss dependencies that DisplayLink needs to function. Install these required packages:

sudo apt install libdrm-dev xserver-xorg-core

If any packages are missing or need updates, let the installer handle them, then reboot your system.

4. Rule Out Hardware/Connection Issues #

Even though USB and audio work, video signals are more sensitive to connection quality:

• Swap out your HDMI/DP cable for a known-good one—faulty cables are a surprisingly common culprit.
• Make sure your Wavlink dock is plugged into a USB 3.0/3.1 port on your laptop. USB 2.0 ports don’t have enough bandwidth to carry video signals from DisplayLink docks.

5. Dig Into System Logs for Errors #

System logs can reveal hidden issues the driver might be hitting. Run these commands to filter for DisplayLink-related messages:

dmesg | grep -i displaylink
dmesg | grep -i evdi

Look for errors like "failed to initialize" or "timeout"—these can point to specific compatibility issues or driver conflicts.

6. Try a Manual Xorg Configuration #

If the system isn’t auto-configuring the DisplayLink display, we can add a custom Xorg config file. Create a new file at /usr/share/X11/xorg.conf.d/20-displaylink.conf with the following content:

Section "Device"
    Identifier "DisplayLink"
    Driver "evdi"
    Option "AccelMethod" "none"
EndSection

Save the file, reboot your system, and check if the monitor now receives a signal.

A Quick Note on Ubuntu 17.10 #

Keep in mind that Ubuntu 17.10 reached end-of-life years ago, meaning it no longer gets security updates or driver compatibility fixes. If none of the above steps work, upgrading to a supported LTS version (like Ubuntu 20.04 or 22.04) would likely resolve the issue, as newer releases have better out-of-the-box support for DisplayLink devices.

内容的提问来源于stack exchange，提问作者Jacob