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Re:OS X 10.10 Yosemite: The Ars Technica Review by Cymen on Friday October 17, 2014 @03:43AM (#8469845)
The only way I can keep my MBP retina happy when using it with an external Thunderbolt display is:

1) before plugging into display, open lid and wait for login screen to appear

2) before unplugging display, open lid and wait for laptop screen to turn on (normally I keep my laptop closed when connected to the display)

If I deviate from this the laptop crashes or goes into some odd state.

Re:OS X 10.10 Yosemite: The Ars Technica Review by atonse on Friday October 17, 2014 @11:50AM (#8471545)
I do EXACTLY this to avoid my laptop acting weird when I take it home/bring it to work.
Re:OS X 10.10 Yosemite: The Ars Technica Review by ChikkaChiChi on Friday October 17, 2014 @09:11AM (#8470737)
I've had this same problem on more than one Macbook at work.