Support in other languages: 
Showing results for 
Search instead for 
Do you mean 
Welcome to the Lenovo Community

Welcome to the Forums!

Welcome to Lenovo's Peer-to-Peer Discussion Community!
Please note our guidelines. How to register and login and Community FAQs.
Shape the Future of PCs

Help Lenovo Shape the Future of PCs

Take the ownership survey. Share your ideas with our product team
Community Spotlight

Visit the Lenovo Blogs!

Check out the ThinkPad Time Machine
Visit the Community Spotlight Blog
Windows  10

Are you ready for Windows 10?

Get to know Windows 10
Visit the Windows 10 Support Center
Reply
Paper Tape
Posts: 4
Registered: ‎05-13-2011
Location: Pinneberg
0 Kudos

U450P brightness control (only 2 levels)

Using a Lenovo Ideapad u450p and WIndows 7 32bits, controlling the display brightness does work rather unexpectedly.

 

Expected: Keyboard keys change the brightness, where fn+down should decrease it, and fn+up should increase it.

But, observed: The brightness alternates between very bright and very low.

 

the brightness levels are: 0 10 20 30 40 50 60 70 80 90 100
on my u450p the levels: 0, 20, 40, 60, 80, 100 are the same very dark, while the levels 10,30,50,70,90 are also the same very bright.

 

I installed windows 7 several times and the problem persists. Later I discovered that is not important to be in Windows to observe this error, I have exaclty the same in BIOS also.... Trying to modify in BIOS the brightness of the screen, I receive exaclty the same results.I supose that this problem is because of the last BIOS update (2.0.2). How can I solve this problem and where can I find the older version of the BIOS?

Retired Guru
Posts: 2,090
Registered: ‎07-13-2009
Location: USA
0 Kudos

Re: U450P brightness control (only 2 levels)

[ Edited ]

Make sure you have re-booted, enter bios,
load default settings-> save and exit.

Then check if a backup bios file was saved by
Winplash. Maybe at folder C:\Drivers\Bios?

Paper Tape
Posts: 4
Registered: ‎05-13-2011
Location: Pinneberg
0 Kudos

Re: U450P brightness control (only 2 levels)

[ Edited ]

I don't have the old version. I formated the C partition and I lost the old version of the BIOS. Where can I find it on the internet? Or can anyone upload it here?

Community Moderator
Posts: 13,431
Registered: ‎12-07-2009
Location: Česká Republika
0 Kudos

Re: U450P brightness control (only 2 levels)

try to re-install power management.

http://www.krasotaiskusstva.com
Paper Tape
Posts: 4
Registered: ‎05-13-2011
Location: Pinneberg
0 Kudos

Re: U450P brightness control (only 2 levels)

[ Edited ]

Power management is a windows 7 tool. My problem is also in BIOS reflecting . that means the problem is not from windows but a little bit higher (bios driver or something form this level).

 

On the other side, I cannot understand why nobody else has this problem like me. I made a BIOS update and I think because of this I get the problems....Anyway for me can be helpfull to instal the old version of the BIOS but I cannot find it on the internet.

Community Moderator
Posts: 13,431
Registered: ‎12-07-2009
Location: Česká Republika
0 Kudos

Re: U450P brightness control (only 2 levels)

could be power management issue. also, check if issue persists on safe mode,too.

http://www.krasotaiskusstva.com
Paper Tape
Posts: 4
Registered: ‎05-13-2011
Location: Pinneberg
0 Kudos

Re: U450P brightness control (only 2 levels)

I checked all. The problem is still there....And once again... THE PROBLEM IS ALSO IN BIOS. that means, IS NOT FROM WINDOWS or in connection with it.

Paper Tape
Posts: 2
Registered: ‎10-01-2011
Location: Germany
0 Kudos

Re: U450P brightness control (only 2 levels)

hello,

 

its an older thread, i know. but now i have the same problem after flashing new bios. i replaced the display some time ago, but everything was fine.

 

now, display has only 2 brigthness options. light and dark...

 

that is really annoying.

 

anybody got an older bios or some fix for it?

Highlighted
Paper Tape
Posts: 2
Registered: ‎10-01-2011
Location: Germany
0 Kudos

Re: U450P brightness control (only 2 levels)

ok i fixed it now.

removed replacement display, put in broken old one, with old it worked. put in new again, now it works also with the new one.

 

possible solutions:

 

1. only remove battery?

2. cable or connector was loose

3. some other thing

 

 

maybe this helps ya out... took me now 2 hours of try and error