Color white is using high value (bright or gamma)

I want report here an problem with color.
I not understand if is a problem bug in nvidia driver or the OS.
Using Ubuntu 21.04 with nvidia binary driver 465.27.
The problem is in screen any area using white color use a high value (bright or gamma).

Please see the links below with the screenshots
https://ubuntuforums.org/showthread.php?t=2463488&highlight=white+color

Trying a solution and nothing at moment.
Thanks for read my post.

Please post screenshots here, the ones at ubuntuforums require registration.

Thanks for your reply.
I has tested Ubuntu 20.04.3 and that extremely less problem with white color thus I not understand if is or not driver issue.
I will post screenshot soon.

Here the screenshots.
Tested using a game that use much white color with Ubuntu 20.04.3 and 21.04

1screen 20.04.3

compare with 21.04

more anothers

20.04.3

21.04

20.04.3

21.04

====
Here the xorg.conf

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 “Stereo” “0”
Option “nvidiaXineramaInfoOrder” “CRT-0”
Option “metamodes” “1366x768_60 +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}”
Option “SLI” “Off”
Option “MultiGPU” “Off”
Option “BaseMosaic” “off”
Option “Coolbits” “8”
Option “ColorSpace” “RGB”
Option “ColorRange” “Full”
SubSection “Display”
Depth 24
EndSubSection

===

OS not using any software color correction and nvidia control panel using all default settings and even changing the display color settings (bright, contrast and gamma) not remove the white color issue.
I not understand if is bug in nvidia driver or OS issue.
Only reporting here because has some users trying an fix and at moment I not see how fix it if using Ubuntu 21.04.
Ubuntu 20.04.3 even thus has that white color problem , but extremely less than 21.04.