Radeon Contrast Changes

Changing Native LVDS Contrast on Thinkpads

XVideo Contrast

The xvattr program can be used to change the contrast of videos being played with programs like wxvlc and mplayer.

Native LVDS Contrast on Radeon

On many thinkpad models, the LVDS panel contrast cannot be changed using standard tools. In Microsoft Windows, this is done with the proprietary ATI configuration program. However, neither fglrx nor the radeon driver can do this.

The best options to try is the ddccontrol program, which is quite old and probably will not work.

It seems the i2c interface could be used to do this, and that's what ddccontrol uses, could be used directly with programs like i2cset, but this seems not to work.

The new radeontool, which is scheduled to go into jaunty, may be the best hope to be able to control this.

This post to ddccontrol-usrs talks about trying to make ddccontrol do this, and this post to xorg-driver-ati notes the same problem.