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Punch Card
Posts: 3
Registered: ‎01-08-2016
Location: United Kingdom
Views: 1,347
Message 1 of 2

Ideapad Z500 Keyboard back light - stopped working after Windows 10 upgrade

Hi Thanks for you help and comments in advance!


System information:


OS: Windows 10

Device: only the Standard PS/2 device is listed in the device manager which is stange because there use to be a HID also listed under keyboard 

Keyboard driver version number/date: 10.0.10586.0  (21/06/2006)



I have upgraded to windows 10 and since the doing so, I have encountered several problems (scanner not working, dimmed monitor-resolved, F7 Aiprlane mode button not working - resolved) and now the dreadded keyboard backlight is not working (it definitely worked before). The NumLock and CapsLock work fine and they do light up.


I have tried the following:



Fn+Spacebar - does not work


Bios upgrade-  does not work and no errors detected during scan in CMD (somone posted a string in another post to do this)


Window updates driver updates - still does not work


Installed latest Lenovo energy Management - Still does not work




Are the backlights for the NumLock and CapsLock on the same ribbon as the main backlight. Should the main back light work if the NumLock and CapsLock are working?


Is it worth deleting keyboard from device manager - will it auto detect the keyboard, PnP detect (I can't afford to be without a keyboard


Not sure what these device manage events log mean or if they help:


Device ACPI\IDEA0102\4&1bc423ef&0 was migrated.

Last Device Instance Id: ACPI\IDEA0102\4&1bc423ef&0
Class Guid: {4D36E96B-E325-11CE-BFC1-08002BE10318}
Location Path:
Migration Rank: 0x0
Present: false


Device ACPI\IDEA0102\4&1bc423ef&0 was configured.

Driver Name: keyboard.inf
Class Guid: {4D36E96B-E325-11CE-BFC1-08002BE10318}
Driver Date: 06/21/2006
Driver Version: 10.0.10586.0
Driver Provider: Microsoft
Driver Section: STANDARD_Inst
Driver Rank: 0xFF2000
Matching Device Id: *PNP0303
Outranked Drivers:
Device Updated: false
Parent Device: PCI\VEN_8086&DEV_1E59&SUBSYS_397717AA&REV_04\3&11583659&0&F8


Device ACPI\IDEA0102\4&1bc423ef&0 was started.

Driver Name: keyboard.inf
Class Guid: {4D36E96B-E325-11CE-BFC1-08002BE10318}
Service: i8042prt
Lower Filters:



Any suggestions on how to get this back light working again.



Thanks again!




Punch Card
Posts: 3
Registered: ‎01-08-2016
Location: United Kingdom
Views: 1,286
Message 2 of 2

Re: Ideapad Z500 Keyboard back light - stopped working after Windows 10 upgrade



I purchased a genuine second hand keyboard online fo £22.00 and the backlight is working perfectly.


A good way to test the functionaility of your keyboard is to see if the light comes on during the boot-up. If it does not then it is either a loose connection or a faulty keyboard.


It is worth opening up the keyboarg to see if there is a loose connection...see this video on how to do it, it very simple and will take you less than 5 minutes.


If the connection are ok and you still do not see the back light working during the boot up, then I am afraid to say that you have a faulty keyboard. Don't waste you time like I did trying to get it to work...get a replacement!

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