Need to press CTRL to resume screen

[Anoy74]

Hello,
I've a Lilliput um1010, currently attached to a pc with ubuntu server.
It's directly connected with usb, and shows up correctly my console. The weird thing is this:

my display start freezing after a while when is not in use (seems like an idle mode??) and i need to press CTRL on my keyborad to see the correct video again.

Someone can help me in this? There are some specific drivers for ubuntu server? Or it can be power supply issue?

I'm really getting so mad... :confused:

[Anoy74]

Some pictures:

after a while video output looks like this:
https://image.ibb.co/mHv1aa/17342380_1726992324280177_1305200241_o.jpg

so i need to press CTRL on my keyboard to view all correctly. I've tried everything, also changeing the cable

https://image.ibb.co/j0VpTv/17391957_1726992414280168_2093808635_n.jpg

Suggestion?