Ville Syrjälä of Intel's Linux team sent out a massive set of 23 patches that re-work the DRM kernel driver's frame-buffer compression handling.
Ville wrote, "This series rewrites the FBC code to actually work. It utilizes the hardware tracking/nuking as much as possible, eg. relying on hardware nuke on flip when possible. I also introduce the generic ring and vblank notifier gizmos which could be used for various other things. I already included a patch to convert the IPS enable to be asynchronous by using the vblank notifier. Other users for thse could be mmio flips, watermark programming, atomic gamma/color correction (single buffered registers all) updates from vblank interrupt, etc."
Many low-level changes were made to the Intel DRM driver that led to over one thousand lines of new code being introduced. Hopefully this FBC support is indeed in good shape so it can be flipped on. With the patches, Ville is trying to enable Intel frame-buffer compression support by default for Intel "Ironlake" hardware and newer. Assuming the patches get reviewed favorably, the changes could wind up in the Linux 3.17 kernel cycle that will get underway in about two months.