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I have a Thinkpad T495 which is also AMD based. When I 1st got it battery life was atrocious under Linux. Kernel release 5.17 greatly helped battery life. Now it is just horrible even with TLP installed. The battery life under Windows is about double what I get when running Linux. It isn't the only but is the main reason I run Windows and not Linux as my main os on it.

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That's more than three generations older than the 6850U I'm using. It predates the M1 release. It's only a few years ago that we could expect decent battery life without tweaking on Linux, probably just after the T495 series. (-: These days, tweaking with TLP &c could yield worse battery life, in my experience.

I guess we have different definitions of "the last few years".

You're right, that's within a "few" years. I should have said "couple."

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