regardless of whether we throw or not on unblank, the problem at the
root of this bug is that mir and powerd are not synced up about the
power state of the system (clocks, suspend, fb available, etc).  This
problem sometimes manifests in failure in the blank/unblank request,
sometimes a hang waiting for frame posting, and sometimes failure in
hwc's set() function.

If i hold "powerd-cli active" (this should prevent suspending, but not
affect anything with the display requests), I can power button on/off
rapidly all day.

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https://bugs.launchpad.net/bugs/1258655

Title:
  Abort when blanking/unblanking screen; exception thrown from
  mir::graphics::android::HWCCommonDevice::mode(MirPowerMode)

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