mbp 13 late 2013 auto brightness not working

[tea88]

hi guys,

i discovered my auto brightness is not working anymore while i was using my laptop during the night and the brightness failed to adjust and it was just too bright.

I've tried ticking and unpicking the auto brightness checkbox and restarting.
problem still there.

also i am sure it was working fine on mavericks, it might have been something with yosemite update.

any help guys?

 

[sevoneone]

hi guys,

i discovered my auto brightness is not working anymore while i was using my laptop during the night and the brightness failed to adjust and it was just too bright.

I've tried ticking and unpicking the auto brightness checkbox and restarting.
problem still there.

also i am sure it was working fine on mavericks, it might have been something with yosemite update.

any help guys?

Try a PRAM reset: Command+Option+P+R immediately on boot (before the chime). Hold down the key combination, until the Mac chimes for the 3rd time, then release the keys and allow the system to boot.

 

[tea88]

Try a PRAM reset: Command+Option+P+R immediately on boot (before the chime). Hold down the key combination, until the Mac chimes for the 3rd time, then release the keys and allow the system to boot.

thank you for your reply, is this safe to do. Should i do a backup before attempting this?

sorry i am very new to this as this is my first mac.

 

[yjchua95]

thank you for your reply, is this safe to do. Should i do a backup before attempting this?

sorry i am very new to this as this is my first mac.

It's safe.

No backups needed.

 

[sevoneone]

thank you for your reply, is this safe to do. Should i do a backup before attempting this?

sorry i am very new to this as this is my first mac.

You should always have a backup ;-) , but resetting the PRAM(nvram) has no more risk to your data than an ordinary boot.

NVRAM stands for Non-Volatile Random Access Memory, it is used to store several preference setting related to hardware. (Back in the days when Macs ran on PowerPC chips it was called Parameter RAM, hence why it is still called a PRAM reset and the Key Combo is still Command-Option-P-R) It stores things like screen brightness, keyboard backlight, volume and startup disk settings. Just like any RAM it is possible for data to get corrupted from time to time. Resetting zeros it out and the OS writes default values in for all the settings on the next boot.