keyboard back light issue

I have a CM devastator keyboard with back lighting. This keyboard uses the scroll lock key to turn the light on and off. On my system running Ubuntu under other desktop environments like Mate or KDE I can turn the back light on using xset led 3 and I usually have it scripted to turn on after I log in. Under Trinity doing xset led 3 causes the keyboard to flash really quickly once and then the light goes off. Is there something holding the keyboard under Trinity? Is there a way to use the back light? -- John P