Not compatible with HDMI/USB KVM

[Walter Zambotti]

Hi have two N2s (an N2+ and N2).  Both are connected to a Viewsonic 2560x1440 2 HDMI ports monitor where they both work well.

 

One system (N2+) is running Ubuntu 22.04 the other is running Armbian jammy 22.04.01 Kernel 6.0.13 #22.11.2.

 

I have purchased a ATEN CS22H 2 port HDMI/USB KIVM switch.  

 

When I connect both systems to the monitor via the KVM I only get a picture from the Ubuntu system.  The Armbian system is always black.

Can I force the kernel/firmware to be 2560x1440x60hz.  I was looking at this post :

 

 

Regarding forcing the kernel to be a fixed resolution but wasn't sure it was relevant.

 

I am able to connect to the Artmbian system via ssh if I need to.

 

Any suggestions welcome!

 

[Walter Zambotti]

I suspect something is missing from the Armbian meson hardware/firmware, because if I boot two copies of Ubuntu then the KVM appears to operate correctly and if I boot two copies of Armbian I see neither system.

 

Edited February 13, 2023 by Walter Zambotti

[Igor]

On 2/8/2023 at 10:05 AM, Walter Zambotti said:

I only get a picture from the Ubuntu system.  The Armbian system is always black

Kernel is defining hardware features. Which kernel are you using in "Ubuntu"?