USB-C Monitor problems?

Hi I want to run with 2 monitors on my PC Asus PN50. The one but HDMI that runs fine and the other but USB-C that the PC can’t see? I have been inside the settings during viewing. But it simply can not see more screens.

So when I start the computer with both connected monitors, the image appears on the usb-c screen. But the resolution and image format are 1280X1024 px in 5: 4 format. It’s a 16: 9 screen QHD I have. I can not change it in display settings and can no longer see the HDMI screen?

Hope there is someone who can help :slight_smile:

I understand that USB 3.0 is supposed to be quick but for a monitor, that is still quite a bottleneck to get through.

Do you have the displaylink drivers installed?

There have never been problems but USB-C screen on mac etc.

No I have not. How do you do it? :slight_smile:

I would hazard a guess that the 20.04 drivers should work… But here is the support site:

Let us know how it goes or if you need more specific help.

I downloaded it and forget it. But I still have no option to change the resolution in settings or use two monitors.

Do I need to restart my computer afterwards? Sorry for the stupid questions. I’m pretty new to Linux :slight_smile:

Are you using Zorin Core or Lite?

Zorin Core


Can see the following under settings. But I have not changed anything in the BIOS. Then again, it is not a Thunderbolt port that is in the Asus PN50. There is a USB-c port for data transfer, DisplayPort functionality. See more here:

Ah, so Gnome Desktop.
Have you disabled Secure Boot in your BIOS?

Have you installed Gnome-tweak tool?

sudo apt-get install gnome-tweaks

What does

xrandr -q

Show you? Does it list all devices?

Does your configuration file contain any content?

sudo nano /etc/X11/xorg.conf.d/10-monitor.conf

You may be able to change screen resolution through terminal with the xrandr --addmode command, but that will not address why only one display is being detected.


lspci -tv

To chjeck devices.
You can install with (I think. I am not on Gnome Desktop)

sudo apt install bolt

You may need to upgrade your kernel if you need to install bolt. What kernel are you running, now?

uname -a

gnome-tweaks has been installed now :slight_smile:

xrandr -q


Failed to get size of gamma…

Can I go bang my head against the wall,now?

If you do not have it yet:

sudo apt-get install inxi

Then paste output of

inxi -G

kernel 5.4

morten@morten-MINIPC-PN50:~$ inxi -G
Graphics: Card: Advanced Micro Devices [AMD/ATI] Device 1636
Display Server: x11 (X.Org 1.20.8 )
drivers: fbdev,ati (unloaded: modesetting,vesa,radeon)
Resolution: 1280x1024@77.00hz
OpenGL: renderer: llvmpipe (LLVM 10.0.0, 128 bits)
version: 3.3 Mesa 20.0.8

Not much concern, there. Mesa and OpenGL version looks a bit low to me, but shouldn’t not work.
I am sorry to do this to you, but can you pose the output of

sudo lshw

Would usb-c to hdmi cable resolve the issue plus some xrandr tweaking?

Community Moderator
Maybe. Will buy a display cable tomorrow. Then one with HDMI and one with display port. So should one be able to use 2 screens on Zorin os?

I am using two screens now. I was using three, until one of the monitors power card went out.

Okay that sounds good. Then I just do it, instead. From what I have been able to read, there is something about the Linux kernel itself. That they do not support usb-c monitors 100 percent

Can you please reference a link to that? I just tried a search on it and only found some slightly old threads mentioning it. The Linux kernel is up to 5.8 or so, now.
It is possible that information is outdated.
And yes, upping your kernel to 5.6 May help. I admit, I am running 5.5.0-5550 for no other reason than to test it. I figured that was risky on my main machine, but I have had no problems with it.