Strange backlight issue

[waffled]

Hello,

Long story short I opened my laptop to see a few of the keys backlights were not working. I restarted the laptop and now all keys but the "\" work. I have reinstalled keyboard drivers to no avail. Checked for and installed all updates for windows and HP. There has been no liquid damage. There has been no impact damage.

Using Z light I can select the \ key and it lights up top of the return key, selecting the return key lights up the bottom of the return key. Shot in the dark I think it might be a case that Z light is detecting the wrong keyboard layout and assigning one of the return key lights to the \. I cannot work out how to fix it. Attached images to show.

Return selected = bottom return light\ selected = top return light

All lights except \

I'm at an utter loss as to what to try next.

Can anyone suggest anything before I attempt to RMA it?

Edit:Added third image to clarify.

[waffled]

OK slight update.

Thanks to the lovely people at HP help desk. I now know the backlight is working after a bios update but as soon as I log into windows desktop it stops working. At the login prompt it's working correctly, it's only on desktop.

Means it must be a setting within the user profile somewhere but I cannot for the life of me work out what it could be.

[PetrJ_CMi]

I have exactly the same issue. It is working properly with Z light studio 1.0.32. Unfortunatelly, no way to report application bugs at HP site..