Bumblebee video tearing with GeForce GT 520M

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https://bbs.archlinux.org – I'm having issues with video tearing with both my Intel and Nvidia cards.   Seems to be across all applications, though it's particulary bad when using smplayer, mythfrontend or flash videos in Firefox.  Using mythfrontend as a test, I ran with and without optirun.  The Intel card is slightly better than the Nvidia under bumblee, but not by much.  Using primusrun seems to solve the tearing issue in all apps, but completely locks up mythfrontend when I try to exit video playback (The WM seems to be somewhat responsive to key commands, but I can't seem to (HowTos)