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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 / ...
+
+I'm trying to add virtual battery to QEMU. More specifically, if the HOST is running on battery power [laptop] I want to pass this knowledge to GUEST.
+
+I have looked at ACPI folder within QEMU source code, however was unable to find the specific place where I can add this functionality.
+
+Can someone provide me with general roadmap of what should I do and where I should start? I suspect that changing the QEMU source code will not be enough and I will also have to implement a driver for the GUEST. 
+
+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.
+
+Has there been any progress? I'm using KVM for ubuntu 20.04 and would love to have this feature.
+
+The implementation could be similar to the temperature sensor interface proposed here:
+https://<email address hidden>/msg65192.html
+
+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! 
+
+
+I just wanted to add that this would (probably) help solve the error 43 on mobile Nvidia GPU passthrough scenarios. While facing this myself I was able to get it working by simulating a battery and attaching it via an ACPI table.
+Your work is greatly appreciated Sergey.
+Thank you very much!
+
+
+This is an automated cleanup. This bug report has been moved to QEMU's
+new bug tracker on gitlab.com and thus gets marked as 'invalid' now.
+Please continue with the discussion here:
+
+ https://gitlab.com/qemu-project/qemu/-/issues/242
+
+