Dual monitors blinking ; cannot change resolutions??

one of the features of Yosemite was supposed to be its multi monitor support.
well with dual monitors from a 2012 mac mini-i get blinking all the time;
AND under system preferences i cannot alter my monitor resolutions???
this feature was removed??
thanks

Thanks,
But I already set up my xorg.conf for that, and used those commands.   It didn't work.   My xorg.conf right now, though, doesn't have the changes I made because I reinstalled Arch (reinstalled because I started using Kubuntu and decided I preferred Arch).
See my orginal Xorg.conf: http://pastebin.com/ff386ad2

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