HI,
I use a acerV5-122, AMD/ATI Radian ----Kabini. my screen brightness, does not work, I checked out a bug report and found its a Ubuntu bug , not just LL, it affects mostly Acer Aspire models, the solution seems to be to upgrade your BIOS, I think the bug report ended with that conclusion . It may give you a lead, may help, as far as TV goes I would not know ______ don't have one. and Ive noticed that not having one does not affect LL at all. So compromise, keep LL dump the tv .