Solved: Macbook M1 Air pulsing screen brightness

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This one took a little lateral thinking but seems obvious in hindsight. Shortly after getting my MacBook, I noticed that every now and then the screen brightness started pulsing. Bright then dimmer, rinse and repeat.

Discussion online suggested that this was a) rare and b) a premonition of a hardware failure to come. 

Both of which may be true. But I did notice that the pulsing only happened when on mains power and only after a while, or when coming back to the laptop after it had been left on charge. So it was definitely power-related. What if... the pulsing was Apple's way of saying 'the battery is now fully charged, why not disconnect it to save power and to preserve battery longevity'?

What indeed. And viewed in this light it does make sense. And perfectly fits the facts. So when the screen is pulsing, I disconnect the Type C charge lead and use on  battery for the next few days until I deem a top-up is needed. Solved.

The curious thing though... is that no one else has reported this exact state of affairs. Surely if this something Apple had programmed then there would be FAQs and discussions based around this screen brightness pulsing?

Very odd indeed!! Comments welcome.

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