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Lenovo P400 cant adjust screen brightness

    Question

  • Updated to windows 8.1 and now can not adjust my screen brightness on my Lenovo P400. I tried updating the display driver through the device manager and it told me there were no available updates.
    Monday, November 25, 2013 4:19 AM

Answers

  • Hi,

    Have you tried to change sceen brightness at the below of Power Option in Control Panel? if not, please have a try.

    if no use, please try to reset Power setting for test.

    Generally speaking, this problem probably caused by hardware driver problem, such as Graphic driver, Power manger, motherboard driver. You can try to reinstall them for test.

    If problem persists, you cant ry to contact Lenovo support for further assistance. 


    Roger Lu
    TechNet Community Support

    Tuesday, November 26, 2013 2:48 PM
    Moderator

All replies

  • Hi,

    Have you tried to change sceen brightness at the below of Power Option in Control Panel? if not, please have a try.

    if no use, please try to reset Power setting for test.

    Generally speaking, this problem probably caused by hardware driver problem, such as Graphic driver, Power manger, motherboard driver. You can try to reinstall them for test.

    If problem persists, you cant ry to contact Lenovo support for further assistance. 


    Roger Lu
    TechNet Community Support

    Tuesday, November 26, 2013 2:48 PM
    Moderator
  • I am having the same issue. Did you find a solution to the problem?
    Tuesday, December 10, 2013 9:22 PM
  • Hi,

    Have you tried the method above for test?

    Generally speaking, this problem probably caused by Graphic driver problem, please check and make sure your Graphic driver is compatible with Windows 8.1.

    In addition, also make sure your motherboard and chipset driver was upgraded to be latest.

    If possible, also please upgrade your BIOS to be latest.one

    Be warned.  Flashing BIOS is a risky process.  If power is interrupted during the update your machine will be rendered unusable.


    Roger Lu
    TechNet Community Support

    Wednesday, December 11, 2013 2:18 AM
    Moderator
  • Reboot the computer and when it shows Lenovo use the brightness button and it will brighten.
    Saturday, January 04, 2014 8:33 PM
  • Reboot the computer and when it shows Lenovo use the brightness button and it will brighten.
    Saturday, January 04, 2014 8:34 PM
  • No.  The problem is that the VGA Display adapter is incompatible with Windows 8.1.  The solution is to go back to the VGA adapter version 9.x, or uninstall 8.1.

    Wednesday, January 08, 2014 2:01 AM
  • This driver worked for me

    http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS031547

    (I hope that's allowed to be posted here, just a link to the drivers page)

    Monday, January 13, 2014 11:52 PM