Windows power settings and browser sound settings solve different problems. Keeping the display visible will not repair muted browser audio, and enabling sound does not make a sleeping PC run a web alarm. Start by deciding whether this is a short desk reminder or an unattended important alarm. For the latter, keep a separate device alarm as backup.
Find the current power controls
Microsoft’s current Windows 11 guidance places power timeouts under Start, Settings, System, Power & battery, then Screen, sleep, & hibernate timeouts. The exact labels can vary across Windows updates and device types. Check both the plugged-in and battery settings that apply to your session. A screen-off timeout and a sleep timeout are separate controls.
Use Microsoft’s documentation for your device rather than changing unrelated registry or firmware settings. This site does not require disabling Windows security features. If you temporarily extend a timeout for a work session, note the original value and restore it afterward. A work or school computer may enforce its own power policy; use an approved alternative when that policy conflicts with unattended browser timing.
Check the speakers before the clock
Open the homepage and use Test sound at a comfortable volume. Confirm where it comes out. Windows can send audio to a monitor, headset, docking station, or other connected device. If the preview is silent, check the browser tab’s mute state, the selected system output, and the application volume controls before repeatedly changing alarm times.
For the first test, use a built-in tone. Once that works, test a custom recording or file separately in the advanced studio if you want one. A successful file import is not the same as successful playback. After reconnecting a dock or headset, repeat the sound test because the output route may have changed.
Run a short end-to-end rehearsal
- Keep the laptop open, or use the desktop in its normal powered setup.
- Set an alarm a minute or two ahead and confirm its saved time.
- Keep the page visible and wait for the signal.
- Dismiss the test and set your real reminder.
- Use a separate backup if missing the reminder would matter.
This checks the current browser session and sound route. It is not proof of behavior after a restart, sleep, a browser update, or a different power mode. Avoid closing the lid during the rehearsal and then assuming an unseen web page will remain active.
Background tabs and sleep are different
A browser can delay background callbacks to reduce resource use. AlarmClock.live recalculates countdowns from a target time when it gets a chance to run, so the visible reading may catch up when you return. It cannot deliver a sound retroactively at a deadline that passed while execution was suspended. Saving a countdown in browser storage is also not a Windows scheduled task.
The Keep screen awake option asks the browser for support and reports its state. Fullscreen provides a larger display. Neither should be treated as a system-level promise to wake the computer. If you need unattended operation, choose an appropriate native reminder and verify that device’s own behavior.
Describe a problem precisely
For a support message, include the browser, whether Windows was on battery or plugged in, whether Test sound worked, and whether the page stayed visible. Mention if the device locked, slept, restarted, or changed audio output. Do not send passwords, private recordings, or account screenshots. Those observations help distinguish an audio problem from a page that did not get an opportunity to run.
Sources
These are documented setup steps and product guidance, not a claim that every device has been tested.