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Energy Saver

Dealing with the insomniac Mac

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What to do with the Mac that either won’t go to sleep at all, or keeps waking up and discharging its battery? It’s pmset or Sleep Aid.

June 30, 2022 Macs, Technology

Last Week on My Mac: Hurricane and Icestorm

Asymmetric Multiprocessing (AMP) can bring great economy in power and heat production. So why don’t we make better use of it on M1 Macs?

September 5, 2021 Macs, Technology

How your Mac may talk in its sleep thanks to HID

If you power your Mac from a UPS with a USB connection, sleep may not be all it’s supposed to be.

June 20, 2020 Macs, Technology

Battery health management in Catalina 10.15.5

Full details of the new battery health management feature in 10.15.5, and how to monitor battery health.

May 29, 2020 Macs, Technology

Should you leave your Mac running all the time?

What are the benefits to leaving your Mac running all the time? And the costs? Which should you choose to do?

May 14, 2019 Macs, Technology

Tackling sleep and wake problems

From hardware diagnostics to pmset and resetting the SMC, all you need to know about diagnosing wake and sleep problems.

May 9, 2019 Macs, Technology

The uninterruptible power of a cat: replacing my UPS

The cat broke my UPS. Here’s how I chose its replacement, and installed it despite the cat. Why are they sold by so few outlets, though?

December 15, 2018 Macs, Technology

Sleep, Wake, and Startup: Hardware and ACPI

Shutdown cause codes, wake reasons, ACPI, and sleep states – diagnosing problems from hardware events.

August 8, 2017 Macs, Technology

Known bugs in macOS Sierra 10.12.6: an incomplete summary

Lists bugs in macOS itself, not those manifest in third-party software running on it. Please report and I’ll keep the list updated.

July 21, 2017 Macs, Technology

The mysteries of sleep: what’s making my hard drive sleep?

Can your Mac control sleep of its display, disks and system independently of one another? Many can’t.

May 17, 2017 Macs, Technology

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