Early reports from owners of Microsoft’s Surface Book premium-priced notebook and the Surface Pro 4 tablet today said that a firmware update issued Wednesday has fixed their devices’ sleep problems.

“Overnight (~8 hours) unplugged, I lost 8% of the battery, but doing a sleep study showed that it actually DID go into a low-power state, for 99% of the time it was asleep, for the first time ever,” said someone identified only as dmills6788 in a thread on Microsoft’s own support forum. “So in that respect it worked, and will probably keep it from getting super hot and kicking the fan on.”

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