Benjamin Herrenschmidt wrote:

I'm still curious what makes a difference between module and
built-in.

There seems to be quite some difference between module and 
built-in for framebuffer drivers. Quite some time ago I 
reported a problem with nVidia framebuffer driver making the 
screen go nuts or simply blank (but no lock-up; could still 
blind type). I finally discovered that the problem only 
happened when the driver was compiled as a module.

-- 
Giuseppe "Oblomov" Bilotta

Can't you see
It all makes perfect sense
Expressed in dollar and cents
Pounds shillings and pence
                  (Roger Waters)