To set up the ATI Displays control panel to work with pixelmad,
You need to download and install the driver.
https://support.ati.com/ics/support/...ge&folderID=27
and possibly the driver update - the latest as of now is the January 2005 update:
https://support.ati.com/ics/support/...ge&folderID=27
then after install and restart - point the panel at pixelmad.
Setttings are shown here: