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
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