kernel pre-emption and software speech

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Hi all,
I have noticed that kernel pre-emption wreaks havoc with software speech, 
causing symptoms like spelling out commands or even the output of commands 
like ls letter by letter along with slow responsiveness.  I am trying to 
find a way to turn off kernel pre-emption on the fly if that is even 
possible so that distributers of livecd linux flavors can still keep their 
fast x performance and we can have our accessibility.  Is it possible to 
do this, or would there need to be a separate, non-pre-emptable kernel in 
a distro?
Cheers,
Josh





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