Cannot alter the screen brightness preboot on Dell Precision's with Nvidia switchable graphics disabled

摘要: Information about a limitation with Precision 7x30, 7x40, and 7x50 mobile workstations. The LCD brightness cannot be changed outside of the operating system when switchable graphics are disabled. ...

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症状

 

You cannot change the screen brightness outside of the Operating System when switchable graphics have been turned off

 

The internal LCD brightness on these computers cannot be adjusted outside of the operating system (OS) when switchable graphics are disabled.

This is using either the brightness sliders for battery or AC-power, or the keyboard shortcut in the BIOS methods. However, both methods work as intended when the switchable graphics are enabled or you are in the OS.

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

Systems specific to the issue:

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

原因

Not Applicable.

解决方案

Note: This is a limitation of the technology involved. It is not a fault with your computer. Your computer 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.

Note: If you are seeing a different issue with your LCD's brightness, please check out the following article:
 

受影响的产品

Precision 7530, Precision 7540, Precision 7550, Precision 7730, Precision 7740, Precision 7750
文章属性
文章编号: 000131620
文章类型: Solution
上次修改时间: 19 4月 2026
版本:  9
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