The display brightness on your Lenovo IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX cannot be adjusted — the Fn+F5/F6 brightness keys do not change brightness, the brightness slider in Settings is stuck, or brightness automatically drops to minimum on battery. Lenovo Vantage and AMD Radeon driver updates restore brightness control on the IdeaPad 5 Pro Gen 8 AMD.
“IdeaPad 5 Pro Gen 8 AMD brightness keys stopped working after reinstalling Windows. Found Lenovo Vantage was not installed. Installed from Microsoft Store and installed AMD Radeon driver via Vantage. Brightness keys worked immediately. Vantage is essential for hardware function keys on Lenovo laptops.” – Zulaikha, postgraduate student from UPM
Fixes for display brightness not changing
Install Lenovo Vantage
Search Lenovo Vantage in Microsoft Store and install. Vantage provides the hotkey service that maps Fn+F5/F6 to AMD backlight control. Without Vantage the brightness keys produce no effect on IdeaPad 5 Pro Gen 8 AMD.
Update AMD Radeon driver
Lenovo Vantage → System Update → AMD Radeon Graphics Driver. The AMD driver contains the display backlight control interface used by Windows brightness slider and Fn key shortcuts on the IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX platform.
Disable adaptive brightness
Settings → System → Display → Brightness. Turn off Change brightness automatically when lighting changes. Adaptive brightness overrides manual control, making it appear that brightness keys are not responding when the ambient sensor immediately resets the brightness after each keypress.
Check power plan brightness
Settings → System → Power → set to Balanced. Power Saver plan reduces display brightness on battery to minimum to save power. Switching to Balanced allows brightness to remain at user-set level when unplugged on the IdeaPad 5 Pro Gen 8 AMD.
Additional brightness fixes
Check Display brightness slider in Settings
Go to Settings – System – Display. The brightness slider must be interactable and not greyed out. If the slider is missing or greyed, the AMD display driver is not correctly installed. Open Device Manager – Display adapters and verify AMD Radeon Graphics appears without a yellow warning icon. If it shows Microsoft Basic Display Adapter instead of AMD Radeon, the AMD driver is missing and must be reinstalled from Lenovo Vantage System Update or from amd.com for the Ryzen 7 7745HX (Phoenix) integrated Radeon graphics.
Restart Lenovo Vantage Service
Press Windows+R and type services.msc. Find Lenovo Vantage Service and Lenovo Hotkey Service. Right-click each – Restart. The Lenovo Vantage hotkey service intercepts Fn+F5/F6 key combinations and translates them to Windows brightness adjustment API calls. A stopped or crashed Vantage service causes all Fn key shortcuts including brightness, volume, and microphone mute to stop working on the Lenovo IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX until the service is restarted or the laptop is rebooted.
Frequently Asked Questions
How do I fix display brightness not changing on Lenovo IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX?
Install Lenovo Vantage from Microsoft Store. Update AMD Radeon driver via Vantage. Disable adaptive brightness in Settings – Display. Set power plan to Balanced. Restart Lenovo Vantage Service in services.msc.
Why are brightness keys not working on Lenovo IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX?
Lenovo Vantage not installed or Vantage hotkey service stopped (most common). Install Vantage from Microsoft Store. Restart Lenovo Hotkey Service in services.msc if Vantage is installed but keys still do not respond.
Does Lenovo IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX have automatic brightness?
Yes – ambient light sensor with adaptive brightness via Lenovo Vantage Eye Care and Windows adaptive brightness. Disable in Settings – Display if it interferes with manual brightness control from Fn keys.
Why does Lenovo IdeaPad 5 Pro Gen 8 AMD screen appear too dark on battery?
Power Saver plan reducing brightness on battery. Set to Balanced in Settings – Power. Also disable adaptive brightness. Both settings can independently reduce screen brightness when unplugged on the IdeaPad 5 Pro Gen 8 AMD.
Conclusion
Lenovo IdeaPad 5 Pro Gen 8 AMD Ryzen 7 7745HX display brightness not changing in Windows 11 is resolved by installing Lenovo Vantage from Microsoft Store to restore the hotkey service that maps Fn+F5/F6 to AMD backlight control. AMD Radeon driver update via Vantage provides the correct display backlight control interface for the brightness slider in Windows Settings. Adaptive brightness disable prevents the ambient light sensor from overriding manual brightness adjustments. Balanced power plan prevents automatic brightness reduction on battery. Lenovo Vantage Service restart in services.msc restores Fn key responsiveness without requiring full system restart on the IdeaPad 5 Pro Gen 8 AMD platform.
Ryan holds a Computer Science degree and has spent over 15 years troubleshooting Windows hardware and driver issues across major laptop brands. He writes practical, step-by-step guides for everyday users at softwaredriverdownload.com.
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