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I just got a brand new Dell XPS 13 9360 and replaced Windows with Ubuntu 16.04.1. Everything seems to work out of the box, except for few issues with video output to external monitor.

I bought two adapters from Aukey: USB-C to VGA and USB-C to HDMI. The first one is working flawlessly, but HDMI one has few issues.

My usual monitor is a 24" FullHD Samsung TV monitor: when I connect it through the adapter, audio is working fine but it looks like that colors are rendered with a 16-bit palette, thus making it unusable (I tested the adapter on Windows before wiping it and it works correctly).

I tried on another Samsung TV monitor with the same issue.

I tried also on a Toshiba TV and it works correctly all the time, so there must be some issues specific to Samsung displays and Ubuntu when using USB-C adapters (the same display had no issues with my previous computer running Ubuntu).

The only workaround I could find is to turn off Samsung TV monitor, connect it to my XPS and then turn it on: in this case it works correctly. But after unplugging, if I want to plug it again I have to turn monitor off and on again.

For the moment I can live with this, but I was wondering if anyone had the same problem and found a definitive solution.

Kaz Wolfe
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Igor Saggese
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4 Answers4

4

With the Kernel 4.13 this issue is fixed for me.

Downloading and Installing for X64

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13/linux-headers-4.13.0-041300_4.13.0-041300.201709031731_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13/linux-headers-4.13.0-041300-generic_4.13.0-041300.201709031731_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13/linux-image-4.13.0-041300-generic_4.13.0-041300.201709031731_amd64.deb

Installing the packages

sudo dpkg -i *.deb

Now just reboot and enjoy using your USB-C to HDMI adapter.

Reference : https://en.cristiantala.cl/fixing-ubuntu-usb-c-to-hdmi-dell-da200/

CTala
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3

For me the workaraund is setting the audio to hdmi port, as soon as I do that colours on the external monitor become correct.

fedecupe
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1

Here's a work around that restored normal picture for me. (If laptop screen is still operational it's very easy to try, but I have carried out some of these steps with the dysfunctional HDMI screen.)

  1. On your laptop click on the System Menu and select System Settings (The System Menu is the right most menu icon on the menu bar at the top of the screen; an iconic portmanteau of a Power Symbol and a Settings Cog Symbol)
  2. Under Hardware, select Displays
  3. Click on the offending display in the "Display Map"
  4. Below the "Display Map" there is a toggle beside the "Name of the Screen" you've just selected, toggle it to the Off position
  5. Click Apply the changes
  6. When prompted to do so, click on Restore previous configuration.
Rob
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1

You can also try lowering the resolution of the second display. In my case, only after setting it down to 1080x720, can the usbc-to-hdmi output the display correctly.

My laptop Alienware 13 R2 and my adapter is DA200. Although not the same model with you, I guess it may still work since they are both produced by Dell. My system is Ubuntu 16.04.02 with Kernel 4.8.

fzheng
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