Dark screen or poor contrast on Fedora 17

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:

acpi_osi=Linux acpi_backlight=vendor

to /etc/defaut/grub’s GRUB_CMDLINE_LINUX variable and rebuild grub via:

grub2-mkconfig > /etc/grub2.cfg

As it turns out, the issue I experienced was two fold: a mythtv frontend setting which inadvertently turned on “night mode” and a unusual TV setting which I solved by these steps.