After upgraded to Buster the Energy Settings is problematic: get blank screen on laptop and the power off button is the only way

[Csanyi Pal <csanyipal@gmail.com>]

Hello,

I just upgraded to Debian Buster from Stretch.

I am running it on an Acer Aspire V3-571 laptop.

I am using XFCE Desktop Environment ( in Stretch I used it also ).

In the Energy ... Settings I did set up in Stretch that that after 3 
minutes of inactivity the screen comes blank and it works so far.

But, from there I can't wake up the laptop, whatever I am doing: moving 
or clicking with the mice, hit Shift, Esc, Enter, Cursor Down or Up, 
these does not help to get back to my Desktop.

The only way to get it back is to hold down the Power button until it is 
shutted down, then hit again Power button to start the laptop.

I purge the apmd package, but that does not helped me out.

How can I solve this problem?

Meanwhile I switch off in the Energy ... Settings that that the Screen 
come blank after some inactivity, but that does not help either.

--
Best, Pali