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Why does my battery life drops when I use a dual boot with windows?

hm flag

I have a very weird problem that makes absolutely no sense.

When I installed Ubuntu in dual boot for the first time on my GF's PC (Asus ROG GL... Laptop), it worked great, and battery life was excellent (4 hours on a full charge). For a few days it was all running smoothly, but as soon as she booted it into windows, and then back into Linux, the battery life sucked, less than half of what it was the day before (1h and a half on a full charge).

We accepted our fate and decided not to bother fixing that, but after the 22.10 update, the problem was fixed. The battery life got up to what it was after a fresh install. But once again, as soon as she rebooted it into windows and back into Linux, it dropped to less that half of what it was just before.

I know it shouldn't be a problem, that battery doesn't care what os it's running on, but I've had kind of similar problems with a wifi card, for which I had to disable the option "allow windows to disable this device for battery saving" (or something like that) for it to work under Ubuntu.

Do you have any idea what might be the problem?

I sit in a Tesla and translated this thread with Ai:

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