[ubuntu] 12.04 LTS hdmi not working

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http://ubuntuforums.org – Hello! Let me first explain that I'm not exactly using Ubuntu, I'm using Chrubuntu (an Ubuntu version for those of us who are stuck with a Chromebook). When I still used Chrome OS, the hdmi worked fine, I could connect to the t.v just fine. Ever since I installed Ubuntu (Chrubuntu) 12.04 lts I haven't been able to get it to work. I connect the cable, but no image, sound, or any type of sign that the connectiong might have been recongnized. Just in case you wonder, I've only used 12.04 lts, no version before or after. If anyone knows about this issue and how to solve this, or can help me figu (Hardware)