I believe FBC is disabled. Here's what I found in /sys:

jeff@jeff-yoga:~$ sudo cat /sys/kernel/debug/dri/0/i915_fbc_status
FBC disabled: disabled per chip default
jeff@jeff-yoga:~$ sudo cat /sys/kernel/debug/dri/64/i915_fbc_status
FBC disabled: disabled per chip default

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https://bugs.launchpad.net/bugs/1395182

Title:
  Screen tears on xrandr orientation inverted

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