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[Feature Request] Battery Status / Virtual Battery
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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