Buffer related input event bug? -- 1.4.1~git20080131

[Tiago Vignatti]

Rohan Lean escreveu:
> Hello,
> 
> I already asked this question in #xorg on freenode, but it did not seem
> to generate any answers there. I am sorry if this reposting causes any
> inconvenience.
> 
> Was there any change done between 1.3.0.0 and 1.4.1~git20080131 that
> would induce some seemingly buffer related bug in the forwarding of
> input events to clients?
> Ever since I upgraded to Ubuntu 8.04, when I move the mouse fast in
> games, all input is being delayed and processed in large chunks until
> the situation stabilizes again after I have not moved the mouse at all
> for a while.
> My rough estimate for the speed at which this happens is 30cm/s at
> 1800CPI, or 21260C/s.
> The effect is exacerbated when I remove the CorePointer option from the
> mouse. Then it already happens at very low speeds.
> The bug does not occur on the Desktop itself.
> 
> I am fairly certain that it is related to xorg, as downgrading SDL to
> the version that was used before the distribution upgrade did not change
> anything.

Simon Thum recently did an work to improve the acceleration scheme on 
Xorg. Unfortunately it only resides in repository from upstream. Try it 
and see if solve your needs. There is some info here:

     http://bugs.freedesktop.org/show_bug.cgi?id=8583


Cheers,

-- 
Tiago Vignatti
C3SL - Centro de Computação Científica e Software Livre
www.c3sl.ufpr.br