Eric Cooper wrote: > > In both 4.0.3 and 4.1.0, the X server would spin using 100% of the CPU > on my IBM ThinkPad 600 (NM 2160). Turning on Option "NoAccel" stopped > this, but performance was unacceptable. None of the various "xaaNo*" > options I found in the archives seemed to help. > > Finally, I found that using > Option "ShadowFB" > works well. The man page for shadowfb(4) seems to be missing, so I > have no idea why this works. (I guess it's the general principle that > adding a layer of indirection can fix any problem :-)
It works because it disables acceleration. The performance is better because it renders to a memory buffer and only copies modified regions into the actual framebuffer. -- Earthling Michel Dänzer (MrCooper) \ Debian GNU/Linux (powerpc) developer CS student, Free Software enthusiast \ XFree86 and DRI project member
