contrast control in a VGN- A115S

[xgiro]

Please, how can I control de contrast of the screen in a VGN- A115S?
Thanks for your attention.
Xavier.:smileywink:

[Twisted-Rizla]

Nothing in the control panel?

[xgiro]

In the control panel there is a supposed programme called 'Adobe Gamma'. There I have been changing what it seemed to be different configurations of brightness and contrast, but none of them affect the contrast.
Any other suggestion?
Xavier.