My IGP(ATI Radeon X1200) was working fine with 8.40, and I managed to get it working with 8.41, and I noticed this:
In both, I get general graphical corruption on the desktop, for example, when making a box with the mouse. Videos sometimes worked, sometimes not :/ But my glxgears went from 800~850 to 1200~1250 between the drivers. and most games had noticeable improvement.
what options are you actually using? and are you still using 8.41 or have you moved to 8.42?