Dell Precision's Cannot Change Preboot Brightness with NVIDIA Disabled

Summary: Learn more about a limitation with Precision 7x30, 7x40, and 7x50 mobile workstations. The Liquid Crystal Display (LCD) brightness cannot be changed outside of the operating system when switchable graphics are disabled. ...

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

The screen brightness cannot be changed outside of the operating system when switchable graphics have been turned off. This is seen when using either the brightness sliders or the keyboard shortcut in the BIOS. This happens with either battery only or battery and AC adapter. However, the sliders and keyboard shortcut work as intended when switchable graphics are enabled or it is after booting to the operating system.

Note: The brightness in Windows 10 can still be modified using the keyboard shortcuts with switchable graphics enabled or disabled.

Affected Platforms:

  • Dell Precision 7530
  • Dell Precision 7730
  • Dell Precision 7540
  • Dell Precision 7740
  • Dell Precision 7550
  • Dell Precision 7750

Cause

This section is Not applicable to this article as it is working as expected.

Resolution

Note: This is a limitation of the technology involved. It is not a fault with the laptop. The laptop is working as designed.

Dell has moved to using UEFI mode only in the BIOS. However, the current switchable graphics technology from NVIDIA does not support using the brightness controls outside of the operating system. The graphics output protocol does not support this.

Affected Products

Precision 7530, Precision 7540, Precision 7550, Precision 7730, Precision 7740, Precision 7750
Article Properties
Article Number: 000131620
Article Type: Solution
Last Modified: 29 Jun 2026
Version:  10
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