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.