Auto Lock iPhone X: How to Set It & Fix It
Auto Lock on the iPhone X controls how long the screen stays on before it locks itself, and you can set it in Settings under Display & Brightness. If your iPhone X screen keeps turning off too quickly or never sleeps, this guide shows you how to adjust the setting and what to do when Auto Lock is grayed out.
What Auto Lock Does on iPhone X
Auto Lock is a power-saving feature that puts your iPhone X to sleep after a set period of inactivity. When the phone locks, the display turns off, and you need to press the side button, tap the screen, or use Face ID to wake it again. The default setting on most iPhone X units is 30 seconds, which balances battery life with usability. You can choose from 30 seconds, 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, or Never.
Unlike older iPhones with a Home button, the iPhone X relies on Face ID and the side button. Auto Lock still works the same way, but the setting is buried in a slightly different menu location than on older iOS versions.
How to Change Auto Lock on iPhone X
Here are the exact steps to change the Auto Lock duration on your iPhone X (works on iOS 12 through the latest iOS 16/17):
- Open the Settings app (gear icon).
- Tap Display & Brightness.
- Tap Auto Lock.
- Choose a time: 30 Seconds, 1 Minute, 2 Minutes, 3 Minutes, 4 Minutes, 5 Minutes, or Never.
- Exit Settings. Your choice is saved automatically.
If you pick Never, the screen stays on indefinitely while you are actively using the phone. However, the iPhone X will still lock if you press the side button or if Face ID fails repeatedly. Also note that Never is not available when Low Power Mode is on (see below).
Why Auto Lock Is Grayed Out or Missing
Many iPhone X users find that Auto Lock is grayed out or missing entirely. The most common cause is Low Power Mode. When you enable Low Power Mode (from Control Center or Settings > Battery), iOS forces Auto Lock to 30 seconds and disables the option to change it. To fix this:
- Go to Settings > Battery.
- Turn off Low Power Mode.
- Return to Display & Brightness – Auto Lock should now be tappable.
Another cause is an iOS bug or a corrupted settings file. If the option is still grayed out after disabling Low Power Mode, try restarting the phone (press and hold side button + either volume button until the slider appears). If that fails, go to Settings > General > Reset > Reset All Settings. This does not delete your data, but it resets Wi-Fi passwords, wallpaper, and other preferences.
Auto Lock vs. Screen Timeout: Same Thing?
Yes, on the iPhone X, “Auto Lock� and “screen timeout� refer to the same setting. Some Android phones call it “Screen timeout� or “Sleep,� but on iOS it is always labeled Auto Lock. The setting controls how long the display stays on after your last touch, not how long the phone stays fully awake in the background. For example, if you are watching a video, the screen may stay on because the video app keeps the display active, even if your Auto Lock is set to 1 minute.
There is also a separate setting called “Require Face ID� (Settings > Face ID & Passcode) that controls how soon you need to authenticate after the screen locks. Auto Lock determines when the screen locks; Face ID determines how often you must scan your face after that. They work together but are not the same.
Common Problems and Fixes
Here are the most frequent Auto Lock issues on iPhone X and what to do:
- Screen turns off too quickly while reading: Set Auto Lock to 2 or 5 minutes. If you still want the screen to stay on for a specific app (like a recipe or a map), use the Guided Access feature (Settings > Accessibility > Guided Access) to temporarily disable Auto Lock for that session.
- Screen never locks even though you set a short time: Check if an app is playing audio or video in the background. Some apps (like music players or navigation) keep the screen awake intentionally. Force-quit those apps and test again.
- Auto Lock resets to 30 seconds after every unlock: This is normal if Low Power Mode is on. It is also normal if you have an MDM (Mobile Device Management) profile installed from a workplace – employers can enforce a specific Auto Lock time. Check Settings > General > VPN & Device Management.
- Screen stays on during a call: That is by design. The proximity sensor keeps the screen off while the phone is near your ear, but if you take it away, the screen turns on so you can use the keypad. Auto Lock does not apply during active calls.
Battery Life: What Auto Lock Setting Is Best?
A shorter Auto Lock time saves battery because the display is the biggest power drain on the iPhone X. The OLED screen on the iPhone X is efficient, but it still uses significant power when lit. Here is a rough guide:
- 30 seconds – best for heavy users who want maximum battery life, but it can be annoying if you read slowly.
- 1 minute – a good balance for most people.
- 2–3 minutes – useful for reading articles or following recipes.
- 5 minutes – for presentations or when you need the screen on for longer stretches.
- Never – only use this when plugged in or for specific tasks; it will drain your battery noticeably if left on.
If you notice your battery draining faster than usual, check if Auto Lock is set to Never or a long duration. Also, remember that Raise to Wake (Settings > Display & Brightness) will wake the screen when you pick up the phone, which can make it seem like Auto Lock isn’t working.
Auto Lock and Face ID: How They Interact
When your iPhone X locks automatically, Face ID is immediately armed. The next time you look at the screen, it will unlock without you swiping – but you still need to swipe up from the bottom to go to the Home screen. If you have Attention Detection enabled (Settings > Face ID & Passcode), the phone will only unlock if your eyes are open and looking at the screen. This works hand-in-hand with Auto Lock: if you set Auto Lock to 30 seconds and then stop looking at the screen, the phone locks quickly. If you set it to Never, the screen stays on, but Face ID will still lock the phone after a few minutes if you are not looking at it – this is a separate security feature called “Require Attention for Face ID� that cannot be turned off completely unless you disable Attention Detection.
Frequently Asked Questions
Why is Auto Lock grayed out on my iPhone X?
The most common reason is that Low Power Mode is enabled. Turn it off in Settings > Battery. If it is still grayed out, check for a device management profile (Settings > General > VPN & Device Management) that may enforce a specific lock time.
Can I set Auto Lock to 10 minutes?
No. The iPhone X only offers preset intervals: 30 seconds, 1, 2, 3, 4, 5 minutes, or Never. There is no custom slider. If you need exactly 10 minutes, you can use Guided Access to disable Auto Lock temporarily, but the setting itself cannot be set to 10 minutes.
Does Auto Lock affect battery life significantly?
Yes. The display is the largest battery consumer on the iPhone X. Reducing Auto Lock from 5 minutes to 1 minute can extend battery life noticeably over a day. However, the difference between 30 seconds and 1 minute is small. The biggest drain is setting it to Never.
Why does my iPhone X screen turn off even when I’m using it?
This usually happens when you are using an app that does not prevent sleep, and your Auto Lock time is short. Some apps (like video players) keep the screen on, but others (like web browsers) do not. If you are reading, try increasing Auto Lock to 2 or 3 minutes. Also, check if the Raise to Wake feature is causing the screen to turn off when you lay the phone flat – that is normal behavior.
How do I make the screen stay on forever?
Set Auto Lock to Never. However, this is not recommended for daily use because it will drain the battery and may cause screen burn-in on the OLED display over time. If you need it for a specific app, use Guided Access instead, which allows you to temporarily disable Auto Lock and even restrict touch input.
Related
Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.