Sorry that I do not know how to describe this problem in one sentence.
I have a APU based thin client, with DVI-D output to a FullHD monitor.
All these works fine with Ubuntu Precise.
Today I switched to TCL 4.x. And found that Xorg is not shown fullly. There is a black edge around the content.
Then I noticed that the console (tty) is not full. Or the BIOS interface.
What should I do without compiling a default kernel?