I have a usb to vga display adapter using the DL-165 chipset. I have tested it functions with windows and linux (Fedora 42/rawhide (20260227); gnome/wayland and debian 12; xfce4/x11) with different monitors. It’s having issues with one monitor in particular on linux. Monitor is restricted to 1280×720. Many different devices have had issues with vga on this monitor in the past. In windows I can get it to work by changing to a lower resolution on the vga to usb display adapter via display adapter properties. I don’t know how I would do this with the udl module in linux.
gdctl in Fedora; gnome/wayland doesn’t detect the monitor. xrandr in debian 12; xfce4/x11 doesn’t detect the monitor. (after udl initialization and cannot find any crtc or sizes ) Dmesg in debian 12 keeps showing a repeating ‘EDID block 0 is all zeros’ errors. I don’t get similar output in Fedora just Cannot find any crtc or sizes after udl initialization.
Are there tools available to change supported display resolution on the adapter via the udl module directly?
