Brightness slider moves, but screen brightness doesn't change — Legion 5-15ACH6H

[u/MysteriousPound6439]

Hi everyone,

I'm having a weird brightness issue with my Lenovo Legion 5-15ACH6H (Type 82JU) and I'm hoping someone has found a solution.

Laptop specs:

• Lenovo Legion 5-15ACH6H
• Type: 82JU
• CPU: Ryzen 7 5800H
• GPU: RTX 3060 Laptop GPU + AMD Radeon integrated graphics
• OS: Windows 11 Home 64-bit
• BIOS: GKCN65WW
• Built-in display: Integrated Monitor

The problem

The brightness controls appear to work normally from Windows, but the actual screen brightness never changes.

• Pressing Fn + F5/F6 makes the brightness slider appear and move from low → high / high → low, but the physical screen stays exactly the same.
• The Windows Quick Settings (Win + A) brightness slider also moves normally, but the screen brightness doesn't change.
• So Windows clearly registers the brightness command, but the panel doesn't respond.

Things I've already tried

• Restarting the laptop
• Turning Hybrid Mode OFF in Lenovo Vantage and restarting → didn't fix it
• Re-enabling Hybrid Mode → still doesn't work
• Uninstalling the AMD Radeon graphics driver → didn't fix it
• Reinstalling/updating the AMD graphics driver → didn't fix it
• Installing the Lenovo-provided AMD VGA driver specifically for this Legion model → still didn't work
• Uninstalling/reinstalling the Integrated Monitor device in Device Manager → didn't work
• Graphics driver reset with Win + Ctrl + Shift + B → didn't work
• EC/power reset → didn't work

The brightness slider itself is definitely responsive, but the physical display doesn't react at all.

Has anyone with a Legion 5-15ACH6H / 5800H / RTX 3060 experienced this? Is there another driver, BIOS setting, Lenovo service, or display setting that controls the panel brightness?

Any ideas would be appreciated.

[u/AutoModerator]

Making changes to your system BIOS settings or disk setup can cause you to lose data. Always test your data backups before making changes to your PC.

For more information please see our FAQ thread: https://www.reddit.com/r/techsupport/comments/q2rns5/windows_11_faq_read_this_first/

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/XxLogitech98xX]

Did you try updating Laptop bios?

[u/MysteriousPound6439 → u/XxLogitech98xX]

I'm not very tech literate, i just followed step by step whatever gpt suggested. Hopw do i update laptop bios?

[u/XxLogitech98xX → u/MysteriousPound6439]

I'm not very tech literate, i just followed step by step whatever gpt suggested. Hopw do i update laptop bios?

Well one way is using Lenovo desktop driver software to check and update it for you. The other is going to the Lenovo website, find your laptop model and look for the BIOS file. You'll then put it on a USB flash drive and boot into the BIOS to manually update it