Screen brightness gets dark when unplugged

[GIJOE3325]

I have a model HP 17-g121wm that goes dark when power supply is unplugged, so dark I can barely see the screen.

Yes, I have looked at all display and screen settings, but it makes no difference. The battery is new and fully charged at 100%. I am using Windows 10 with a new SSD that I just installed. 

[zoey7886]

@GIJOE3325, Welcome to the HP Support Community!  

Thanks for reaching out about your query regarding Solving Screen Brightness Issues on HP 17-g121wm! 

We're thrilled to have the opportunity to assist you and provide a solution.  

When your HP 17-g121wm laptop screen gets significantly dark after unplugging the power supply, there are several aspects you can inspect or adjust:

1. Power Plan Settings

Windows 10 often reduces screen brightness to conserve battery life. Adjust the power plan settings as follows:

Open Settings:

• Press Windows + I to open the Settings.

Navigate to System:

• Click on System.

Power & Sleep:

• Select Power & sleep on the left sidebar.

Advanced Power Settings:

• Scroll down to the Related settings section and click on Additional power settings.

Change Plan Settings:

• Choose your active power plan and click Change plan settings.

Adjust Advanced Settings:

• Click Change advanced power settings.

Display Settings:

• Expand the Display section, then the Enable adaptive brightness section. Ensure it is set to Off for both On battery and Plugged in.

2. Battery Saver Mode

Windows 10 has a Battery Saver mode that automatically lowers screen brightness when activated.

Open Action Center:

• Click the notification icon at the bottom-right corner to open the Action Center.

Disable Battery Saver:

• Click on Battery saver to disable it if it's turned on.  

Hope this helps! 

Take care, and have an amazing day!  

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Regards,