I request an adopter for the radeontool package, since I don't have any Radeon hardware available to test it.

The package description is:
 Radeontool is a small utility to control ATI Radeon based laptops' backlight
 and external output functions. It is also able to dump the contents of
 registers for debugging purposes.
 .
 WARNING: Radeontool code has not been completely audited and may contain bugs
 that could damage your hardware. Use at your own risk.