I just installed Ubuntu 12.10 on an external hard drive and it is booting just fine. I have a Dell Latitude E6230 with an Intenl HD Graphics 4000 video display adapter.
For some reason, when this laptop is connected to my TV via HDMI and I boot in Windows 7, everything comes up just peachy and I can watch movies on the TV.
However, when I boot the laptop through the external hard drive and connect to the TV via HDMI in Ubuntu 12.10, I cannot get the display to work on the TV. I will get "Ubuntu" to come up temporarily, but then the TV just goes black when I select HDMI input source just like I did with Windows connected.
Any ideas on how to troubleshoot/fix this? It's a shame that Windows 7 works and Ubuntu doesn't with the HDMI... I am very green with Linux/Ubuntu, so please be specific in your responses. Thanks.