HP Thinclient T5740 dual monitors only cloned output DPort - VGA

Hi,

I have a HP Thinclient T5740 with 1.04 bios and HP ThinPro linux image.

The issue is that when I have two monitors connected the same image appears on both of them and I need separate displays.

This setting is from the POST and BIOS. The same image appears on VGA and DPort output.

Is there a setting to have two separate displays (Extended desktop) ?

I've tried a lot of settings but I do not see in bios any setting that will allow something to be changed.

The video chip is GL40 and from SO i change the setting  but does not apply.

Any help is appreciated.

Thanks