> > > What we need is to add an option to the driver so that it samples > > the current value when X is launched and uses that. > > Where can X get that info ? Read it from the register :) It needs to read CLOCK_CNTL_INDEX to figure out which of the PPLL_DIVx was used by the firmware or radeonfb, and then read the corresponding register and extract the value. It should read PPLL_REF_DIV too. Ben.