Does your Vizio TV screen go black? Do you still get sound? It could be related to the power saving techniques built in to the TV. I found this posting after spending some time searching. It took a bit to find the right search query because it is an odd problem. According to that posting,
The problem isn’t directly related to Fedora 17, but it is related to Linux. There have been reports of other distributions experiencing the same issue. The belief is that it is a GRUB issue, or some brightness/contrast problem with Xorg based upon what it is getting from GRUB. One thing to try is to add:
A small tool for interfacing with the control module on DELL servers is the “ipmitool” package. It comes in handy when you need to do some basic detective work but do not want the baggage that comes along with the Dell OpenManage packages. ipmitool sel list ipmitool sel clear You can even get fancy with