Bug#168926: Missing 1280th pixel column on Radeon with LCD panel.
I am using an ATI Radeon 7500 QW graphics card, with an Iiyama 1600x1200
LCD display, connected to the digital port of the graphics card, with a
resolution of 1600x1200. The 1280th pixel column on the display is
missing. That is the 1279th pixel column is directly followed by the
1281st pixel column. We have four of these systems set up, and all of them
display the phenomenon in Linux, but not when we tested it with Windows.