External Monitor Zoomed In on Fedora 42

Ask Fedora
1

Hi everyone,

I’m running Fedora 42 on a ThinkPad T480s and using a Lenovo 40AY docking station. I have two external monitors connected via the dock, both capable of 2560x1440 resolution.

Here’s the issue:

  • When both external monitors are set to 2560x1440, one of them displays correctly.
  • The other one (center monitor) appears zoomed in, even though the resolution is reported as 2560x1440 in the display settings. Parts of the desktop are cut off.
  • If I change the center monitor to 1920x1080, the zooming issue still exists.

Some notes:

  • I’m using Wayland (confirmed via $XDG_SESSION_TYPE).
  • Display arrangement is: Laptop (left) – Center monitor – Right monitor.
  • I’ve tried adjusting layout in GNOME display settings (aligned them precisely), but the issue persists.
  • xrandr doesn’t help (as expected under Wayland).

Has anyone seen this behavior or found a workaround? Could this be an EDID or dock firmware issue?

Any suggestions are appreciated!

Thanks in advance.

2

It’s a HW limitation of the T480s with USB-C docks. You need a Thunderbolt-3 or 4 dock for both displays configured at QHD@60Hz.

https://support.lenovo.com/us/en/solutions/pd029622#USB-C%20dock

image
image889×753 91.2 KB

both monitors configured at QHD@30Hz should work if supported by monitors.

The 40AY dock can support both displays, but only if connected to a DisplayPort1.4 capable system.

workaround: connect one display to the system with a USB-C to DP / USB-C to USB-C cable.

2 Likes