Default led notification

Just as on 4.4.2, led notification does not work for me after
upgrade to 4.4.3. I used ota, stock, no root.
Some posts claim the light works out of the box for some
people. Since it is not my case, I'd like to use light mana-
ger and hear what this forum say about battery drain and
memory usage. The app is about 5 times smaller than
light flow lite. My preference is to have it out of any com-
pulsive battery usage.
Or I might miss some configuration in default led app?
Best regards.