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Keep This Mac Awake > With the Lid Closed is a plain switch now. 1.50.1 installed a root LaunchDaemon behind the administrator prompt, which set `pmset disablesleep` while the app asked for it. The app now turns off lid sleep in the kernel's power management root itself (`kPMSetClamshellSleepState`, a call any process may make), the method LogoLight ships as Lit with Lid Closed. That switch has no owner (read from Apple's sources of the kernel and of powerd): the kernel keeps it after the process that set it has gone and honours it on battery, macOS's power daemon and LogoLight write the same bit, and clearing it under a closed lid puts the Mac to sleep at once. On an Apple silicon Mac it is also what keeps a docked MacBook awake with its lid closed, set by the power daemon once, when a display comes. So a child process holds it (`src/lid_awake.rs`, this binary with `--keep-awake-lid`): - it sets the switch again every second and holds two assertions with it (system sleep and idle sleep), the three LogoLight measured together; - it reads the power source itself and holds nothing on battery; - it writes nothing at all while an external display is connected: a zero from here would put a docked Mac to sleep, or leave it without its closed-lid mode until the display is plugged in again. What the child set before the display came is cleared once the display has been gone for five seconds, and the child outlives the app for that if it has to; - it lets go when the pipe from the app closes (quit, crash, Force Quit) and when the app has not written for a minute (a hang), the assertions first, then the switch; - it ignores SIGHUP, SIGINT and SIGTERM, so the pipe is its one way out; - it leaves the switch alone at its end while LogoLight holds it for itself (LogoLight sets it once and would not notice it gone). One child at a time holds a lock on `lid-awake` next to `desktop.json`, and the file is non-empty while the switch may be set. A child that was killed leaves it marked and unlocked: the app turns lid sleep back on when it sees a child end and at its next launch, and the next child takes the mark over. The status line says what came of it: the kernel took the call, the lid is left to macOS at a display, on battery, refused, or that the Mac slept under the lid all the same and until when. A display has its own wording so a Mac that sleeps there never reads as covered. The helper of 1.50.1 is no longer installed or used. Its request file is never written and is deleted at launch, so a helper that is still there does nothing. While it is installed the menu has Remove the Old Lid Helper…, the one item left behind the administrator prompt. `macos/keep-awake-lid.sh` and its vitest suite go with the install path. Checked on a Mac mini (macOS 27.2, no lid, no display): 276 tests, clippy and fmt; the kernel takes the call from an unprivileged process; the real child holds its assertions, lets go on a closed pipe and after a minute of silence, ignores SIGTERM, waits for a child before it, writes nothing when told a display is connected, and a SIGKILLed child is replaced by the app and its mark undone. 34 deliberate breaks of these rules each fail a test. Not run yet: the app itself with this change (the mini has no session to open it in), a real closed lid, the menu items, and the removal of the old helper. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>