I have a problem with Ubuntu 12.04. I am running on a Zotac Z68ITX motherboard, which has both a NVidia graphic card GT430 onboard, and a Intel integrated one on chip. I set the PGE/PCIEx option in the BIOS and plugged into the nvidia DVI port to my TV HDMI IN.
The Ubuntu is freshly installed. I also installed the nvidia-current drivers and I can successfully boot and run glxgears. The problem occurs when I log out. Instead of getting back to the lightdm login, I get this "corrupted text"
After this, the screen goes back to low res, and it blanks to a corrupted blinking cursor. I can't do anything except rebooting. Even ctrl-alt-f1 does not switch to text console. Rebooting is only possible with the off button. It shows more lines of corrupted text as the services are shut down.
Edit: I don't know the reason behind the garbled text, but I was able to get to a console after the event, and starting X manually leads to the following error
NVIDIA: could not open the device file /dev/nvidia0 (Input/output error)
I am browsing around, but I haven't settled on a solution yet, mostly because I am doing other things in the meantime.