I installed 13.10 and i have problems with my display. Everything else works fine. I cant control my brightness. I thought the graphics driver is the problem. So i went to software updates, switched to another driver (proprietary) and the Ubuntu screen went black and i wasn't able to boot either. I cant use my lap with such low brightness. Then i reinstalled 13.10 again, This time full hdd reset. Same problem occurred. I grabbed radeon hd7730m for Linux x64 from the amd site, installed it, and the screen went black with only the "x" cursor showing on the next boot. What should i need to do to make my brightness work and stabilize graphic cards as mine is switchable graphics type.