> The effect has also been seen with -nvidia, but not with -ati or -fglrx.
Are you sure? I was able to reproduce the problems described in http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=478836 with the radeon driver.
Your analysis sounds like the server could simply be getting swamped with draw line requests and not dealing with it gracefully.
> The effect has also been seen with -nvidia, but not with -ati or -fglrx.
Are you sure? I was able to reproduce the problems described in http:// bugs.debian. org/cgi- bin/bugreport. cgi?bug= 478836 with the radeon driver.
Your analysis sounds like the server could simply be getting swamped with draw line requests and not dealing with it gracefully.