Antialiasing problem after setting Color Space to "Linear"

Now I read the thread you posted and am astonished that this problem seem to exist since Unity 3 and hasn´t been fixed yet! :frowning:

The thread leads to this:

The first post there suggests as a workaround to add some code (listed there) to the lighting function resp. write an own lighting function. Unfortunately I´m not familiar with that at all. So can you tell me where to put that code or what to do to implement that workaround?

But the main question still is: What is different at my site that causes the problem in opposite to so many others who obviously don´t encounter it?