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Cannot Adjust LCD Brightness - IdeaPad G400,G500,G400s, G500s


After G500 was installed with Windows 7 and the drivers from website, the LCD brightless can only be adjusted to the brightest or darkest level after pressing F11 & F12 key. However, it can adjust brightness normally under Windows 8.


Affected configurations

The above symptom may occur to the following systems:
Lenovo G400\G500 shipped with panel SECLTN156AT32-L01 (18200969) with BIOS versions older than V1.07
Lenovo G400s\G500s shipped with panel SEC LTN156AT30-L01 (18200896) with BIOS versions less than V1.11.

The above symptom may occur under the following operating system:
Microsoft Windows 7



For G400\G500, update BIOS to 1.07 version or above version.
For G400s\G500s, update BIOS to 1.11 version or above version.


  • Alias ID: IN20130815-002
  • Document ID: HT078787
  • Last Updated :3/26/2014
  • (c) 2014 Lenovo