For the moment this saved my situation:
Section "Monitor" Identifier "L1717S" Option "DPMS" Modeline "Centered" 108.00 1280 1336 1448 1692 1024 1025 1028 1066 +hsync +vsync Option "PreferredMode" "Centered" EndSection
For the moment this saved my situation:
Section "Monitor"
Identifier "L1717S"
Option "DPMS"
Modeline "Centered" 108.00 1280 1336 1448 1692 1024 1025 1028 1066 +hsync +vsync
Option "PreferredMode" "Centered"
EndSection