Not really. See for example NVidia and their inability to use proper kernel APIs (DMA-BUF) for their optimus support because that API is GPLed and the kernel doesn't provide an exception for it, like it does for some other APIs:
http://www.phoronix.com/scan.php?pag...tem&px=MTIwNDI
If the kernel actually was LGPL, they would be able to use that API.