Can't stop display mirroring at start up?

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ever since went recovery mode repair disk since upgrading yosemite, computer mirrors login screen external display. wasn't doing before on yosemite. tried resetting pram nothing. it's annoying because adapts screen size of external display.

tips?

also, while on login screen, when unplugging , re plugging in display, settings while revert normal.
 

just realized each time restart computer new space created! after launching mission control had 13 desktops! not normal!
 


Forums Macs macOS OS X Yosemite (10.10)


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