ASUS · Vivobook 15 F1504 · i5-1235U
Screen Brightness Not Changing Fix
Screen brightness not changing on the ASUS Vivobook 15 F1504 i5-1235U means pressing Fn + F5 (decrease brightness) and Fn + F6 (increase brightness) has no effect, the Windows brightness slider in Action Center shows movement but the screen does not change brightness, or brightness is stuck at maximum or minimum levels. The Vivobook 15 F1504 has an Intel UHD Graphics controller managing display output. Brightness control requires both the Intel Graphics driver and the ASUS ATK hotkey driver to function.
Fix 1: Install Intel Graphics Driver from ASUS Support
Download the Intel UHD Graphics driver for the ASUS Vivobook 15 F1504 from ASUS Support. The ASUS-certified Intel Graphics driver includes ASUS display configuration data for the F1504 panel. Without this driver, Windows uses the Microsoft Basic Display Adapter which does not support brightness control via the Intel display backlight interface. The brightness slider in Action Center will move but the display brightness will not change.
Fix 2: Install ASUS ATK Package
Download the ASUS ATK Package from ASUS Support for the Vivobook 15 F1504. The ATK package includes the ATK HID driver and ACPI drivers that enable the Fn key hotkey functions including Fn+F5 and Fn+F6 brightness control. Without the ATK package, Fn key brightness shortcuts have no effect even when the Intel Graphics driver is correctly installed.
Per Siti Fairuz, university student using ASUS Vivobook 15 F1504 for online classes: “Brightness keys did not work on the Vivobook 15 F1504 after reinstalling Windows 11. Action Center slider also had no effect. Installing the ASUS ATK Package from ASUS Support for the F1504 fixed the Fn+F5 and Fn+F6 brightness shortcuts immediately. The Intel Graphics driver also needed to be installed for the Action Center slider to work.”
Fix 3: Disable Auto Brightness (Adaptive Brightness)
Open Settings → System → Display. If Brightness has an Automatically adjust brightness option enabled, turn it off. Also open Control Panel → Power Options → Change plan settings → Change advanced power settings → Display → Enable adaptive brightness and set it to Off. When adaptive brightness is enabled, Windows overrides manual brightness changes based on the ambient light sensor, making it appear that the brightness control is not working. Disabling adaptive brightness gives full manual control over the Vivobook 15 F1504 display backlight level.
Fix 4: Update ASUS BIOS
Go to ASUS Support and download the latest BIOS for the Vivobook 15 F1504. BIOS updates include display panel backlight PWM controller firmware and ACPI brightness control method fixes for the i5-1235U Alder Lake-U platform. An outdated BIOS ACPI method can cause the display brightness OSD to appear and the Intel brightness API to accept commands but the panel backlight PWM controller to not change the actual panel brightness, a hardware-level disconnect that BIOS update corrects.
Frequently Asked Questions
Why is the screen brightness not changing on ASUS Vivobook 15 F1504?
The Intel Graphics driver is missing and Windows is using Microsoft Basic Display Adapter, the ASUS ATK Package is not installed for Fn key brightness hotkeys, or adaptive brightness is overriding manual changes. Install the Intel Graphics driver and ATK Package from ASUS Support, disable adaptive brightness in Power Options, and update BIOS for ACPI brightness control fixes.
What are the brightness shortcut keys on ASUS Vivobook 15 F1504?
Press Fn + F5 to decrease display brightness and Fn + F6 to increase display brightness on the Vivobook 15 F1504. These Fn hotkeys require the ASUS ATK Package driver to be installed. Without the ATK driver, pressing Fn + F5 or F6 has no effect. You can also use the brightness slider in Windows Action Center after installing the Intel UHD Graphics driver.
Does ASUS Vivobook 15 F1504 have an ambient light sensor for automatic brightness?
Some configurations of the Vivobook 15 F1504 include an ambient light sensor for automatic brightness adjustment. If your model has the sensor, you will see the Automatically adjust brightness toggle in Settings System Display. Disabling this gives full manual brightness control. If the automatic adjustment option is not visible, your Vivobook 15 F1504 model does not have an ambient light sensor.
Why does the ASUS Vivobook 15 F1504 brightness change by itself?
Adaptive brightness is enabled and the ambient light sensor is automatically adjusting the backlight based on ambient lighting conditions. Open Control Panel, Power Options, Change advanced power settings, Display, Enable adaptive brightness and set both On battery and Plugged in to Off. Also check Windows Settings System Display for the automatic brightness toggle and disable it to stop the Vivobook 15 F1504 from independently changing the screen brightness.
Conclusion
Screen brightness not changing on the ASUS Vivobook 15 F1504 i5-1235U is fixed by installing the Intel UHD Graphics driver from ASUS Support for full Action Center brightness slider control, installing the ASUS ATK Package for Fn key brightness hotkey function, disabling adaptive brightness in Power Options, and updating BIOS for ACPI display backlight controller firmware improvements. Both the Intel Graphics driver and the ASUS ATK Package are required for complete manual brightness control on the Vivobook 15 F1504.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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