Here is how to fix a bug in which the brightness slider controller operates in the opposite direction.
- Change screen brightness to 50%
- Uninstall graphics drivers from Device Manager
- Install all Chipset drivers for your model
- Install Power Management (applies to Lenovo only)
- Update graphics drivers from Device Manager
- Set Power Options to default in Windows
This usually occurs after a clean install of Windows 10 on Lenovo B30 and similar models.
You switch on the computer and it appears to be fine during Startup, but after the Lock Screen when you expect to see your Desktop icons, you have a black screen.
Using the Function keys (often F11 & F12) when you try to turn the brightness up nothing happens. Instead when you turn the brightness down, the brightness actually goes up.
Plug Power Cable In Turns Brightness Down
A further symptom of this bug is that when you plug in the mains charger cable, the screen goes dark, remove it and the screen brightens up. (or vice-versa).
How To Fix
Change screen brightness to 50%
Use the function keys with the brightness icon on them and adjust brightness to approx 50%. (On some models you need to hold FN and press the function keys).
By changing to 50% this means you can see what you are doing on the screen while applying the fix.
Uninstall graphics drivers from Device Manager
Right-click Start Menu, take Device Manager. Expand Display Adaptors, Right-click on your display (for example Intel HD 5550) and Uninstall.
Install all Chipset drivers for your model
Here is link for Lenovo Support UK, look for Drivers & Software, enter your model or serial number and download Chipset drivers.
Reboot as you go along – or when prompted.
For other brands, Acer for example – Google “Acer Support”
Tip: Always search for “manufacturer’s name support”. Never search for the word “drivers”, you’ll end up with malware with the amount of sites offering to provide the drivers.
Install Power Management (applies to Lenovo only)
This may be listed under Additional Software on the support page for your model.
Update graphics drivers from Device Manager
Back into Device Manager, expand Display Adaptors, Right-click on your graphics and click Update Drivers.
Set Power Options to default in Windows
Right-click the battery icon in the task bar, change power options.
In Windows 10 Power Options go for Change Plan Settings and within there click Restore default settings for this plan.