KDE fails to detect monitor

Hello everyone,
I just installed Mageia 4 with three DEs i.e. KDE, MATE and XFCE.
My screen looks good in MATE and XFCE and also the monitor is detected so that I can set the proper resolution.
But when I start KDE, it does not detect my monitor. In the system settings, it shows VGA output, and not the
name of my monitor ViewSonic 17". I am not sure about sound, but login sound also does not look good.
Note: I don't have any Graphics card installed in my PC.
Thanks for any help.
I just installed Mageia 4 with three DEs i.e. KDE, MATE and XFCE.
My screen looks good in MATE and XFCE and also the monitor is detected so that I can set the proper resolution.
But when I start KDE, it does not detect my monitor. In the system settings, it shows VGA output, and not the
name of my monitor ViewSonic 17". I am not sure about sound, but login sound also does not look good.
Note: I don't have any Graphics card installed in my PC.
Thanks for any help.