Zhiyi Zhang (@zhiyi) commented about dlls/win32u/sysparams.c:
break;}preferred_mode->width = found_mode->dmPelsWidth;preferred_mode->height = found_mode->dmPelsHeight;display_freq = found_mode->dmDisplayFrequency;signal_info->pixelRate = display_freq * preferred_mode->width * preferred_mode->height;signal_info->hSyncFreq.Numerator = display_freq * preferred_mode->width;signal_info->hSyncFreq.Denominator = 1;signal_info->vSyncFreq.Numerator = display_freq;signal_info->vSyncFreq.Denominator = 1;signal_info->activeSize.cx = preferred_mode->width;signal_info->activeSize.cy = preferred_mode->height;signal_info->totalSize.cx = preferred_mode->width;signal_info->totalSize.cy = preferred_mode->height;signal_info->videoStandard = D3DKMDT_VSS_OTHER;
I don't know what's the value on Windows. But D3DKMDT_VSS_VESA_CVT seems more common than D3DKMDT_VSS_OTHER.