XFCE power manager can't blank/turn off screens

Just moved to XFCE, and got no idea where to search for a solution because all I’ve found so far is people trying to turn off power saving, not make it work as it should.
So I’ve tried with both blank screen and switch off after settings, but all these settings do is turn off my screens for 1s. In case of switching off it’s worse because it just drops my screens config and sets it to mirroring. My setup is as fallows:
xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 544mm x 303mm
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
DVI-D-0 disconnected (normal left inverted right x axis y axis)
These are iiyama monitors, both of witch are different models,
DP-1 is BlackHawk GB2530HSU - B1
HDMI-A-1 is BlackHawk GE2488HS - B2
I’ll be grateful for any help with my issue.