I'm trying to hookup my low-end 15" MBP to my TV, a Vizio VO22L. It goes Mini Displayport --> DVI --> HDMI. HDMI is the only choice for my current situation. I've followed Apple's instructions instructions on using a MBP in clamshell mode with an external display. The issue is getting my MBP to output the max resolution that my TV supports, 1680x1050. There's a list of available resolutions, but no option to set a custom resolution. Help? Thanks.