screen darken when gnome-terminal activated

[chenzero]

Hello,
after upgraded to the latest Ubuntu 12.04, 3.2.0-59-generic-pae,
I encountered a problem is,
screen will darken when gnome-terminal is activated, however, if use the system color in the profile of gnome-terminal,
the screen is OK.

Please help, thanks!

[chenzero]

after check the monitor settings, I found the reason is,
a feature called "dynamic contrast" is occasionally enabled in monitor ...
it's interesting that this feature only influences gnome-terminal
Thanks!