Zhiyi Zhang (@zhiyi) commented about dlls/winex11.drv/display.c:
*mode = current_mode; }
mode->dmSize = sizeof(DEVMODEW); lstrcpyW(mode->dmDeviceName, display_device.DeviceName);
mode->dmDriverExtra = sizeof(ULONG_PTR);
mode->dmSize = sizeof(DEVMODEW);
You can keep dmSize in the same place.