How to Fix iPhone 17 Brightness That Keeps Dimming in iOS 15.4

Your iPhone 17 screen may look dim even when you manually increase the brightness. It can be annoying, especially when you’re watching videos, playing games, or using your phone outdoors. If this keeps happening, the problem is usually linked to automatic brightness adjustments or temperature protection features built into iOS 15.4.

Here’s how you can fix your iPhone brightness that keeps dimming.

Why Your iPhone 17 Brightness Keeps Dimming

• Auto-Brightness is enabled in Accessibility settings.
• True Tone or Night Shift is adjusting your screen’s color and brightness automatically.
• Attention-Aware Features are reducing brightness when you’re not looking at the screen.
• The device is overheating and dimming to prevent damage.
• Low Power Mode is limiting display performance.

Disable Auto-Brightness.

Auto-Brightness automatically adjusts your screen brightness based on surrounding light. It’s helpful indoors but can cause unwanted dimming in certain conditions.

1. Open Settings, and then tap Accessibility.
2. Tap Display & Text Size, and then scroll down to toggle off Auto-Brightness.

After turning it off, set your preferred brightness manually from Control Center.

Turn Off True Tone and Night Shift.

True Tone and Night Shift both change your display’s appearance based on lighting and time. While they make your screen easier on the eyes, they can also make it look dim.

1. Open Settings, and then tap Display & Brightness.
2. Toggle off True Tone and Night Shift.

Once disabled, your display will maintain consistent brightness and color regardless of your surroundings.

Check for Attention-Aware Features.

iPhones with Face ID can dim the display if they detect you’re not looking directly at it. Turning off this setting stops the phone from adjusting brightness automatically.

1. Open Settings, and then tap Face ID & Passcode.
2. Enter your passcode, scroll down, and turn off Attention-Aware Features.

This ensures your iPhone keeps the same brightness even if you glance away.

Prevent Overheating.

Your iPhone automatically dims the screen when it becomes too hot. This is a built-in safety feature to protect internal components.

Avoid using your phone under direct sunlight or while charging for extended periods. Let it cool down before using it again.

Turn Off Low Power Mode.

Low Power Mode helps save battery by reducing background activity and display brightness. Disabling it can bring your brightness back to normal levels.

1. Open Settings, and then tap Battery.
2. Toggle off Low Power Mode.

You’ll notice your display become brighter once this setting is turned off.

Reset All Settings.

If none of these fixes work, resetting all settings can clear any configuration errors without erasing your data.

1. Open Settings, and then tap General.
2. Tap Transfer or Reset iPhone, and then tap Reset All Settings.

After the reset, set your brightness preferences again to see if the issue is resolved.

Once you’ve tried these steps, your iPhone 17 should maintain consistent brightness throughout use. Keeping your software updated and avoiding overheating will also help prevent this issue in the future.

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