[Bug 1502613] Re: [Feature Request] Battery Status / Virtual Battery

[Sergey Nizovtsev]

mizz,

I'm worked on it and got a working draft on pre-5.0 codebase. It can
react on QMP property changes to trigger ACPI events on x86 and arm-
virt.

However i've stuck on frontend/backend split. Keep calm, i'm still
working on the task and will complete this soon.

Philippe, thanks for advice!

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https://bugs.launchpad.net/bugs/1502613

Title:
  [Feature Request] Battery Status / Virtual Battery

Status in QEMU:
  In Progress

Bug description:
  When using virtualization on notebooks heavily then virtual machines
  do not realize that they're running on a notebook device causing high
  power consumption because they're not switching into a optimized
  "laptop mode". This leads to the circumstance that they are trying to
  do things like defragmentation / virtus scan / etc. while the host is
  still running on batteries.

  So it would be great if QEMU / KVM would have support for emulating
  "Virtual Batteries" to guests causing them to enable power-saving
  options like disabling specific services / devices / file operations
  automatically by OS.

  Optionally a great feature would be to set virtual battery's status
  manually. For example: Current charge rate / charging / discharging /
  ...

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