[LG Optimus L3 II, L5 II, L7 II, L9 II] freeusername:
Was just checking ... from your logcat would look like brightness is being set correctly :

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 170

D/PowerManagerService( 464): userActivity [mUserState]: 3, [mWakeLockState]: 0

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 155

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 141

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 126

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 109

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 98

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 78

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 59

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 42

D/AbstractBrightness( 602): thermal max bright -> 255

I/BrightnessSlider( 602): BackLightBrightness set to 18

D/AbstractBrightness( 602): thermal max bright -> 255

just like on mine :

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 72

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 141

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 162

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 168

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 173

D/PowerManagerService( 1143): userActivity [mUserState]: 3, [mWakeLockState]: 1

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 176

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 178

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 179

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 176

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 170

D/AbstractBrightness( 1563): thermal max bright -> 255

I/BrightnessSlider( 1563): BackLightBrightness set to 165

D/AbstractBrightness( 1563): thermal max bright -> 255

But i notice a ton of strange errors, does this started to happen after you installed certain software or just the kernel ?, could be something with software installed ? Let me know if you can think of something or try to go back to stock to try to isolate the problem, thanks in advance and good luck, Because it looks to me like there's software preventing it being changed afterwards.