Phoronix: Intel, Radeon DRM Get Precise VBlank Timestamps

Mario Kleiner has published patches over the weekend that introduce precise vblank time-stamping support within the Linux kernel's DRM core and has implemented this support already within the Radeon and Intel kernel drivers too. The precise vblank timestamps and counting is needed by the DRI2 sync and swap extensions and in particular to conform with the OML_sync_control extension...

http://www.phoronix.com/vr.php?view=ODcxNQ