Since the 11.10 release of Ubuntu, and now the 12.04 release of Ubuntu, my Radeon HD 6970 has not worked properly with the open source drivers. It always boots up with the corrupted screens as shown in the pictures below. My display setup is a bit unusual; I have a 1280x1024 analog display that I have plugged in to the graphics card via a DVI-to-VGA adapter (also shown attached). These problems do not occur if I use the proprietary driver suite or if I use Windows 7.
Thanks in advance.