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

From: Sergey Nizovtsev
Subject: [Bug 1502613] Re: [Feature Request] Battery Status / Virtual Battery
Date: Mon, 10 Feb 2020 23:22:21 -0000

I've started working on this issue and have some progress. Fedora 31
guest is already able to see a battery device but its state currently
hardcoded. I think i will finish this in a few weeks.

** Attachment added: "qemu-battery-poc.png"

** Changed in: qemu
     Assignee: (unassigned) => Sergey Nizovtsev (snizovtsev)

** Changed in: qemu
       Status: New => In Progress

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  [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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