ALS Not Triggering On FHD Panel When Brightness Manually Adjust ...

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Ambient Light Sensor Not Triggering when Brightness Set to 0% Table of Contents Detailed Article Symptoms Cause Resolution Affected Products Provide Feedback

Summary: This article discusses the XPS Ambient Light Sensor (ALS) Not Triggering on Full HD (FHD) LCD panels when the brightness is manually Adjust to 0%.

Detailed Article

Symptoms

Cause

Resolution

Affected Products

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Symptoms

Affected Platforms:

• XPS 13 9300
• XPS 13 7390 2-in-1

The ALS does not adjust automatically when the end user adjusts the display brightness to 0%.

This issue was discovered on the XPS 13 9300 and XPS 13 7390 2-in-1 with FHD configuration. End users may suspect the ALS is not working properly.

Cause

Not Applicable

Resolution

Microsoft has confirmed this is working as per designed. On FHD devices, the brightness is controlled using lux level. When the brightness slider is set at 0%, the brightness always stays at 0% no matter the environment lux change. Also, the slider will represent the auto brightness bias, and this is why there is no brightness changes from 0% slider after manually setting the brightness to the lowest level.

Affected Products

XPS 13 7390 2-in-1, XPS 13 9300

Article Properties

Article Number: 000124125 Article Type: Solution Last Modified: 02 Dec 2025 Version: 5

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Article Properties

Article Number: 000124125 Article Type: Solution Last Modified: 02 Dec 2025 Version: 5

Find answers to your questions from other Dell users

Visit Community

Support Services

Check if your device is covered by Support Services. Check Support Status