Re: TwinView incorrectly indicates Xinerama as off when using two cards
Thank you both, Bernhard and Aaron.
I had actually tried using the Rotate option some time in the past. However, even the 2D performance was prohibitively slow. In particular, it seemed the rotation was being executed in software (i.e., by my CPU) rather than by the GPU. By contrast, when I use TwinView+XRandR, the speed is normal.
I should try it again, of course, since you are both suggesting it. But any idea as to why the Rotate option is apparently not performed by the graphics card?