C20 2nd monitor doesn't work properly with either Windows or Linux

Support
1

Just bought an AV Access C20 Dock from Amazon. 2nd monitor doesn’t work.
I have two laptops a WFH Zbook running Windows 11 and a Lenova running Linux Ubuntu 2404/gnome.

Both monitors are LG 4K monitors, monitor 1 is a 27UN850 and montitor 2 is a 27MU88. On Windows 11, monitor 2 doesn’t switch to full resolution. On Linux, monitor 2 seems to be alive but doesn’t show the image at all.

Thanks,

–Tom

2

Do you mean the second monitor is stuck at 800x600? I have the same issue

3

Hello Tom,

Thanks for getting back to us and we are truly sorry for the issue.
Our iDock C20 came support dual 4K monitors but the real output reaolution and refresh rate also depends on the laptop graphics card performance, as our product come with DP alt mode, but not the Displaylink based.
But if you would like and try replace with other USB-C cable for a test,such as 40Gbps cable or TB4(USB 4) cable, the provided cable come with USB 3.2 Gen 2 20Gbps.
And for the Linux system we not have a full testing, honestly, comparing with Windows, it is more easily to get comaptibility issue when Linux mount external peripheral, and need Linux system update driver to fix it.

4

How can I tell if I am limited by laptop dispay? before using your kvm… i had one monitor attached to HDMI and a second tablet-like screen attached USB-c and had better than 800x600

5

Kevin, thanks for your reply.

I still cannot make the monitor work with either HDMI output or USB-C output from iDock. I tried running the USB-C between the Lenova and the USB-C input on the monitor.

However, I will not return iDock C20KVM for now because the iDock C20 works very well as a KVM with my bluetooth devices and also works well with Windows 11 zbook laptop.

For now, I bypass the iDock by using a separate HDMI cable directly from the Lenova to the HDMI2 HDMI2 input on the 2nd monitor.

I think some problems may be due to the Intel Alder Link graphics card in the Lenova laptop or bugs in the graphics driver in Ubuntu 24.04.

I think some problems may be due to the Intel Alder Link graphics card in the Lenova laptop or bugs in the graphics driver in Ubuntu 24.04.

Any other suggestions would be welcome.

–Tom

6

No, it seemed to be stuck in 2560x1440 as best as I could tell. I solved that problem by presetting Windows display resolution for 2nd monitor to 3840x1640 and from then on, the monitor detected it when I switch Doc 320 to the input for the Windows machine.