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42 lines
1.8 KiB
Markdown
42 lines
1.8 KiB
Markdown
# Inspect Assertions Preventing Sleep
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The `pmset` command is for inspecting and manipulating _Power Management
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Settings_ on MacOS. The `-g` flag is for _getting_ details. We can get a summary
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of power assertions with `-g assertions`. These assertions are ways that the
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system and display are prevented from sleeping.
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A common assertion preventing sleep is the user being active. Another example of
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an assertion is a program like `caffeinate` that sets a timeout preventing sleep
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for a fixed period of time.
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Here I activate a 30 minute (1600 second) `caffeinate` session and then I
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inspect the power management assertions which shows the details of that
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assertion as well as two others.
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```bash
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❯ caffeinate -t 1600 &
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[1] 98217
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❯ pmset -g assertions
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2025-11-02 13:20:57 -0600
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Assertion status system-wide:
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BackgroundTask 0
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ApplePushServiceTask 0
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UserIsActive 1
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PreventUserIdleDisplaySleep 0
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PreventSystemSleep 0
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ExternalMedia 0
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PreventUserIdleSystemSleep 1
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NetworkClientActive 0
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Listed by owning process:
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pid 98217(caffeinate): [0x00045477000194b3] 00:00:03 PreventUserIdleSystemSleep named: "caffeinate command-line tool"
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Details: caffeinate asserting for 1600 secs
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Localized=THE CAFFEINATE TOOL IS PREVENTING SLEEP.
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Timeout will fire in 1597 secs Action=TimeoutActionRelease
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pid 145(WindowServer): [0x00044f2f00099212] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle serviceID:10009be9e service:AppleUserHIDEventService product:CTRL Keyboard eventType:3"
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Timeout will fire in 600 secs Action=TimeoutActionRelease
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pid 80(powerd): [0x00044f2f00019216] 00:22:34 PreventUserIdleSystemSleep named: "Powerd - Prevent sleep while display is on"
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```
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See `man pmset` and `man caffeinate` for more details.
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