I have been using 12.04 LTS with an HDMI monitor for quite some time now and everything has been working wonderfully. However, recently my HDMI port has stopped working, and I have been all over these and other forums without finding a solution.
I know that the the HDMI cable and the monitor aren't the problem because I have swapped out both these pieces of hardware with no change. I am using an HP Envy laptop. The CPU is an Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz. I am using that CPUs graphics chip - Intel® HD Graphics 4400. I do not have a dedicated graphics card.
:$ xrandr Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767 eDP1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1366x768 60.0*+ 40.0 1360x768 59.8 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9
The above information proves that the system is not aware of the HDMI port hardware, and only the laptops display. It feels to me as if the HDMI port drivers are no longer working.
Might anyone know how to help me fix this? Do I need to reinstall drivers, or install a different kernel? Is there some other issue possibly?
Thanks in advance for any help.