On 28 April 2010 11:19, Patrice Dumas <pertusus at free.fr> wrote: > What do we do on systems with drivers that don't support randr 1.2? Pretty > much all systems with a backlight control use the kernel backlight interface. Sure, but how many open drivers don't support RANDR 1.2? And how many of those have chipsets in common laptops? Richard.