> At least in my case, powertop refused to start (I have to say that I > didn't try to 'calibrate' it).
Please write what errors or output it wrote when it "refused to start". > If you do the same with the > current 'linux-libre' kernel, you will still have some noise, unless > you set brightness of the screen to 100%. I have observed the noise when the backlight PWM frequency is too high at non-100% brightness, I think current libreboot versions wouldn't have this bug (Francis gets uneven brightness when this occurs). I don't know how your two kernel versions differ in backlight handling.
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