Lenovo Yoga Slim 7 AMD Ryzen 7 8845HS Screen Brightness Problem Fix Windows 11

The screen brightness on your Lenovo Yoga Slim 7 AMD Ryzen 7 8845HS cannot be adjusted – the brightness slider in Windows Settings has no effect, keyboard brightness keys do not change the display brightness, or the screen automatically changes brightness without user input. AMD Radeon driver configuration and Windows Display Settings resolve brightness control issues on the Yoga Slim 7 AMD.

This guide covers AMD Radeon driver updates, adaptive brightness settings, and BIOS display configuration for the Lenovo Yoga Slim 7 AMD Ryzen 7 8845HS in Windows 11.

“Yoga Slim 7 AMD brightness keys stopped working after Windows update. Display was stuck at maximum brightness. AMD Radeon driver update from Lenovo Vantage fixed the brightness slider and keyboard shortcut control.” – Fatimah, researcher from UiTM

Why Brightness Control Does Not Work on Lenovo Yoga Slim 7 AMD

The display brightness on the Lenovo Yoga Slim 7 AMD is controlled through the AMD Radeon display driver which communicates with the display panel backlight controller via the AMD Display Interface. When the AMD Radeon driver is replaced by a generic Microsoft Basic Display driver after a Windows update, the brightness control path through the AMD driver is lost and Windows cannot reach the backlight hardware through the generic driver. The brightness slider remains visible in Settings but has no effect on the hardware.

• AMD Radeon driver replaced by generic Microsoft driver – brightness interface unavailable
• Adaptive Brightness auto-adjusting based on ambient light sensor overriding manual setting
• Content Adaptive Brightness Control (CABC) in AMD Radeon Software causing automatic brightness changes
• ACPI display interface driver missing – Fn+brightness keys not recognized

Fix 1 – Update AMD Radeon Driver via Lenovo Vantage

Open Lenovo Vantage and go to System Update. Install AMD Radeon Graphics driver update. Restart. After driver update, open Settings – System – Display and move the Brightness slider. The brightness change should be visible immediately on the Yoga Slim 7 display. Updated AMD Radeon drivers include corrected brightness interface registration with the Windows brightness HAL (Hardware Abstraction Layer) for the Ryzen 7 8845HS AMD Radeon 780M display engine.

Fix 2 – Disable Adaptive Brightness

Go to Settings – System – Display. Look for Automatically adjust brightness or Help improve battery by optimizing the content shown and brightness. Toggle both off. Also go to Control Panel – Power Options – Change plan settings – Change advanced power settings – Display – Enable adaptive brightness – set to Off for both On battery and Plugged in. Adaptive brightness uses the ambient light sensor to automatically adjust display brightness and can conflict with manual brightness control attempts, causing the slider to return to sensor-determined values after user adjustment.

Disable CABC in AMD Radeon Software

Open AMD Radeon Software. Go to Display tab. Find Content Adaptive Brightness Control or Radeon Enhanced Sync and disable. CABC reduces display brightness in dark scenes and increases it in bright scenes to save power, which appears as the display changing brightness automatically without user input. Disabling CABC provides consistent brightness based only on the user-set brightness slider value without scene-content-based adjustments on the Yoga Slim 7 AMD display.

Fix 3 – Reinstall AMD Display Interface Driver

Go to support.lenovo.com, search for Yoga Slim 7 AMD (Gen 8 or your model), and download AMD Display Interface or AMD ACPI Driver from the Display category. This separate driver component handles Fn+brightness key translation to ACPI brightness commands. The keyboard brightness shortcut (typically Fn+F5/F6 on Yoga Slim 7) operates through a different driver path than the Settings brightness slider – both need the AMD Radeon and AMD ACPI Display drivers installed to work correctly.

Fix 4 – Check Lenovo Hotkey Feature Integration

Open Lenovo Vantage and check Keyboard – Function Key Priority. If the Fn key is set to Multimedia keys mode, the brightness keys may not trigger the ACPI brightness command. Toggle to F1-F12 priority mode and test the Fn+brightness keys. Alternatively, try the brightness keys with and without the Fn modifier depending on current key priority mode. Lenovo Vantage also has a display brightness setting in System – Power that may override the Windows brightness slider with its own energy management brightness target.

Frequently Asked Questions

Why is the screen brightness not working on Lenovo Yoga Slim 7 AMD?

AMD Radeon driver replaced by generic Microsoft driver missing brightness interface. Update AMD driver via Lenovo Vantage. Disable Adaptive Brightness in Windows Settings.

How do I fix brightness on Lenovo Yoga Slim 7 AMD Ryzen 7 8845HS?

AMD Radeon driver update via Lenovo Vantage, disable Adaptive Brightness and CABC, reinstall AMD Display Interface driver, check Lenovo Vantage function key priority.

Does Lenovo Yoga Slim 7 AMD have OLED display?

Available with OLED 2.8K 90Hz or IPS panel options. OLED brightness uses pixel-level control rather than backlight dimming.

Why does Lenovo Yoga Slim 7 AMD brightness keep changing automatically?

Adaptive Brightness or AMD CABC enabled. Disable both in Windows Settings and AMD Radeon Software for manual brightness control only.

Conclusion

Lenovo Yoga Slim 7 AMD Ryzen 7 8845HS screen brightness not working in Windows 11 is resolved by updating the AMD Radeon driver via Lenovo Vantage to restore the brightness control interface to Windows. Disabling Adaptive Brightness in Windows Settings and CABC in AMD Radeon Software stops automatic brightness changes that interfere with manual control. AMD Display Interface driver reinstallation from Lenovo Support restores Fn+brightness key functionality for complete brightness control on the Yoga Slim 7 AMD keyboard and Settings slider.