** Description changed:

  Many ACPI features can be disabled, per Colin King's research.
+ 
+ Colin King has demonstrated measurable boot speed improvements (up to 3%)
+ by disabling many ACPI features not used by cloud kernels.  That work also
+ allows us to unhook additional unused subsystems (Nouveau, gpiolib, pincntrl).
+ Disk space utilization of the kernel is reduced:
+   /boot by ~200KB
+   /lib/modules by ~170 Kb

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https://bugs.launchpad.net/bugs/1689372

Title:
  disable many ACPI features

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