I have recompiled my kernel with CONFIG_FB_RIVA=y and now lcd brightness control works flawlessly and usplash is in full color. Thanks for the attention
-- Rivafb framebuffer needed on powerbook 12 https://launchpad.net/bugs/66392 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
