Connected my System76 Lemur Ultra (Intel i5 3210M + Intel HD 4000) to my television. It showed up fine. After about 15 seconds, it abruptly disconnected for some reason with a "no signal" error on the television. The open programs on my computer were having issues opening the window until I unplugged the HDMI cable. I have never tried the HDMI port/cable.
I upgraded my kernel to 3.5.1 yesterday using the stable Ubuntu kernels due to direct connect (Wifi connect by two computers, no router required) and to get more support for my graphics card (HD 4k).
lspci | grep "VGA" returns :
00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09).
It won't even show up on the television at all now. I tried to boot into it with the HDMI cable connected and it doesn't work correctly. If I connect it, it says "Searching for signals" then goes to "no signal" again.
I think it is something with Ubuntu or Linux (kernel). If anyone could help me get this working, it would be much appreciated. I also tried changing the resolution - to no result (I did switch it back). I did change the sound over to the HDMI section instead of the speaker. I didn't get a chance to test the sound however.
Ubuntu 64 bit 12.04 Linux Kernel 3.5.1