Keyboard backlight fails with recent kernels

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I do not use my laptop often, normally my better half has possession and use of it.

It is a late 2011 ASUS ROG G73S which performs very well.

The keyboard backlight was an issue initially under CentOS6, but the kind folks at elrepo found the missing bits in a more recent kernel and created a package to add them to the older CentOS6 kernel.

An upgrade to CentOS7 went without a hitch and the keyboard lighting has worked fine.

Recently I sat infront of the machine and couldn't see the keys - no backlight.

A number of reboots later I have found that the latest kernel that I have on the machine, that works okay is 3.10.0-862.14.4.el7.x86_64

3.10.0-957.21.2.el7 and 3.10.0-957.27.2.el7 both fail to load/activate the driver for the keyboard.

Would someone with the requisite knowledge please advise what I need to do.

Is this a case for using the CentOSplus kernel or do I need to find and load a driver or two? or do I need to request the elrepo folk to make a suitable package.

Thanks
Rob

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