E6400 Keyboard Backlight Key issue

I used to have "Fn+Right arrow" to switch keyboard light in different mode, off->auto->on.  But after updated some DTP application, it doesn't work any more. I still can use DTP application to turn it on / off.  The other key combination (Fn+Up, Fn+Down etc) are working.  Right arrow key function correctly as well.   It should be bios related, since all other Fn keys are good even before windows boot up.  How can I fix this issue?  Thanks!

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