Ubuntu 20.04.5 Nvidia driver 470.129.06 Not Display Suspend Stand By

Hello.
Thanks for read my topic.
OS Ubuntu 20.04.5 using xorg and Nvidia driver 470.129.06 GT 640.
Selecting to Monitor Display enter in suspend stand by mode for 10 minutes not work.
Only trying understand if has any wrong setting.
Below the xorg.conf.
Thanks for your reply.


nvidia-xconfig: X configuration file generated by nvidia-xconfig

nvidia-xconfig: version 470.129.06

nvidia-settings: X configuration file generated by nvidia-settings

nvidia-settings: version 470.129.06

Section “ServerLayout”
Identifier “Layout0”
Screen 0 “Screen0” 0 0
InputDevice “Keyboard0” “CoreKeyboard”
InputDevice “Mouse0” “CorePointer”
Option “Xinerama” “0”
EndSection

Section “Files”
EndSection

Section “InputDevice”

# generated from default
Identifier     "Mouse0"
Driver         "mouse"
Option         "Protocol" "auto"
Option         "Device" "/dev/psaux"
Option         "Emulate3Buttons" "no"
Option         "ZAxisMapping" "4 5"

EndSection

Section “InputDevice”

# generated from default
Identifier     "Keyboard0"
Driver         "kbd"

EndSection

Section “Monitor”
Identifier “Monitor0”
VendorName “Unknown”
ModelName “LG Electronics E1641”
HorizSync 30.0 - 61.0
VertRefresh 56.0 - 75.0
Option “DPMS”
EndSection

Section “Device”
Identifier “Device0”
Driver “nvidia”
VendorName “NVIDIA Corporation”
BoardName “NVIDIA GeForce GT 640”
EndSection

Section “Screen”
Identifier “Screen0”
Device “Device0”
Monitor “Monitor0”
DefaultDepth 24
Option “Coolbits” “8”
Option “Stereo” “0”
Option “nvidiaXineramaInfoOrder” “CRT-0”
Option “metamodes” “1366x768_60 +0+0 {ForceCompositionPipeline=On}”
Option “SLI” “Off”
Option “MultiGPU” “Off”
Option “BaseMosaic” “off”
SubSection “Display”
Depth 24
EndSubSection
EndSection