 So is that revert helps
http://lists.freedesktop.org/archives/mesa-dev/2014-August/066746.html Keep in
mind that revert broke 32bit complitely, lot of corruption :)

  About performance for UE4 demos i can't say a lot, this is on Kabini :) Or if
not reverting just try how it goes with kernel 3.16 that should not hit this
stuttering. And watch requested-VRAM at begening of these demos, for me that is
actually higher then with kernel 3.17 or 3.18-next for the same app :). I am
not trying other demos , but seems like newer kernels requests more VRAM from
the apps :)