Jerome Glisse (the lead Avivo driver developer) has
fixed TMDS issues with the ATI Radeon X1000 series hardware. The latest Avivo git driver changes how the TMDS is programmed (see the
git commit for more information). Another
git commit updated the supported chipset list against AMD's official list, so all products in the ATI Radeon X1000 "R500" series should now have a PCI ID entry. Those of you experiencing any problems with your display in the past, be sure to try out this latest code and report back with your findings.
Discuss in the forums.