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Question

I've had my IdeaPad Notebook P500 for over a year, and rarely had an issue with it.  Today, I accidently touched the F11 key, which happens to be the "Brightness minus" key. Immediately, the screen went very dim, to the point where it actually hurts my eyes to be typing this. 

 

I can adjust the brightness sliders up and down on the screen, using both the F11/F12 keys and the slider box available from the "Brightness" selection under "Settings".  Even though the sliders go up and down, the screen stays the same very dark level.

 

I have uninstalled and re-installed the Intel HD driver.I have shut down the laptop and turned it back on while holding the F12 (Brightness plus) button. I have even rebooted several times.

 

Is there a way I can get this rectified ? 

Answer

Currently, there is a step shared by a community user - changing registry.

 

1- Install latest driver of "Intel Hd Graphic 4000" (WIN 7) : "Intel HD Graphics 4000" (WIN 8)

2- install latest driver of your graphic card

3- This step will fix the problem:

- go to registery by regedit and change the value to 0xf048

 

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000]
"FeatureTestControl"=dword:0000f048


 OR


[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001]
"FeatureTestControl"=dword:0000f048

 

NB : The steps above was preparedby oneofour customers and it has worked for them. Please be advised that Lenovo does not take any responsibility with the alteration of the registry key being done to your machine. By altering the registry key by following the steps above is strictly at your own RISK. 

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Comments
Tashi

There is a solution WITHOUT modifying Regedit.

 

The same problem with an IdeaPad Z400 was posted and answered by a support specialist here:

http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Can-t-adjust-brightness-in-Windows-8-1-for-IdeaPad-Z400/m-p/1292309/highlight/false#M104169

 

I followed those instructions on my IdeaPad P500 after my display went dim after I touched the f11 key once (without holding the Fn key down).  I had updated from windows 8 to 8.1 a couple of weeks ago.  Not sure if that was the issue.

TJF

I used the link above - http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Can-t-adjust-brightness-in-Windows-8-1-for-... - and changed the drivers as described, fixed the issue on my P500 touch. 

 

This loss brightness occurred the same as described above F11 key after the Win8.1 upgrade.

 

I don't know why Lenovo hasn't listed these for driver updates, seems to be a common problem with Win8.1

shravan2007

http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Can-t-adjust-brightness-in-Windows-8-1-for-IdeaPad-Z400/m-p/1292309/highlight/false#M104169

 

Shiva Kumar, the 2 step download & choosing the older version for the video card has help. The resolution is effected but the brightness is back up.

 

Thanks a ton Shiva.

 

Lenovo, it would be great to get the fix to the customers.

shravan2007

I have P500, the dimming problem is fixed, thanks to Shiva Kumars post.

ddelatorre14

Go to Control Panel>Display>Adjust Resolution>Click advanced settings>click properties>click driver tab... After you click update driver, it will ask you "how you want to search for driver software;" click "browse my computer for software" then next window choose "let me pick from a list of device drivers on my computer;" you'll see compatible drivers, look for "Microsoft Basic Display Adapter" click next>

 

-I did it and its back to normal brightness! Smiley Wink

barranquilla11

It worksssss!!! just shut the computer down and while you turn it on again, keep pressed the F12 key...and that's it..it get fixed right away....excelent!!!!

jeffaehlenovo

same exact issue, just over year later, and after an 8.1 Windows update.

Will try solutions suggested above and report.

Mahesh123

Refer the below link for the brightness issue,

 

https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Can-t-adjust-brightness-in-Windows-8-1-for-Idea...

 

It solved the brightness issue after installing the Intel Video Driver. 

 

- Mahesh

deemas

This screen dimness only happened yesterday. But I fixed it by doing what someone wrote here: to hold the f12 key while booting up. I just restarted the computer with f12 held down and lo and behold the screen brightness came back! Thanks!

Full377

I had the same problem with the Dim Display. The problem was the driver. I have Lenovo´s  Idea P400 Touch.  And Intel´s HD 4000 Graphic Card.  Solution....  back to  old driver from  10.x.x.x. to  9.x.x.x.  And all works fine again.

wippernm

I may try going back to a earlier driver.  I have a Y70-70 touch which has a simular problem.  I knew it was more than likely a driver problem and I had looked to the Lenovo driver site and tried the other display drivers but have had no luck.

 

I also have major problems viewing some websites.

dowhitman

I have the same problem and none of these solutions work for me.  I've updated to windows 10 and can't find a driver on the lenovo site to download.  i've downloaded the windows 8 drivers but the problem still exists.  Can anyone help?

katiehoward

I have the same problem. Had this problem previously with windows 8 and suggested fixes worked. Upgraded to windows 10 and can't find a driver that will solve the problem.

 

Hope to hear from someone soon!

fun2fish4bass

Katihoward.....

I just had the same issue.... 3rd time in two years ... Lenovo P500 upgraded to windows 10... my P500 has the Intel video 4000 chipset... I believe some P500's and models in this same model group have Nvidia chipsets.

Display was stuck at about 50% brightness... unable to change the brightness higher or lower through F11 or F12.. unable to change brightness through Video properties for the Intel HD4000 control panel.

I resolved the issue by going to device manager and under display adapters removing the display adapter under properties.... dont wory ... Windows 10 will reinstall a display driver on it's own after it detects the chipset at the next reboot.... you may be promted to search the internet .... going to the latest driver usually fixes bugs.

I also removed the Lenovo power management software that I installed based on the Lenovo website for support for the P500.

Windows 10 does a very good job at managing power without the need for the lenovo app and you can change the defaults for how your laptop manages things like sleep and power off in battery or plugged in modes.  Hope this helps.

fun2fish4bass

Almost forgot... power down completely and restart after deleting the power management app if installed and the display adapter

TrapperX

I held the F12 button down during startup and everything is working great so far.