On Wed, Sep 01, 2010 at 09:35:17AM +0200, LEVAI Daniel wrote:
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> On Mon, Aug 30, 2010 at 23:31:25 +0200, Mark Kettenis wrote:
> > The Xorg xserver runs a scary amount of code in a signal handler.
> > It's supposed to make your mouse cursor move more smoothly, but I
> > can't spot the difference when I disable that "feature".  Instead,
> > this "feature" breaks certain multi-card setups and god knows what.
> > 
> > So we're considering switching this off by default.  Before we do
> > that, we'd like to do some wider testing.  If you're regularly sitting
> > behind an OpenBSD machine running X, can you add the following lines
> > to /etc/X11/xorg.conf (or create one with these lines):
> > 
> > Section "ServerFlags"
> > 	Option "UseSIGIO" "false"
> > EndSection
> > 
> > and restart X.  Let me know if you observe any significant changes in
> > behaviour.
> 
> My cursor acts as usual. It occasionally turns into a big vertical
> arrow-like thing, and I got the well known radeonhd bug [1] - "The
> cursor shows weird corruptions at some points of the screen", although
> I'm not using the radeonhd driver.
> 
> However, using this option, after starting firefox everything gets
> extremely laggy, and I can interact with my machine with the keyboard or
> mouse with 4 seconds intervals. After commenting this option, the
> behaviour returns to the usual.

I have seen something similar on my testing on an older Dell with
Intel 845GM as I recall. The mouse and keyboard are unresponsive
while loading a busy page with many ads. I put this down to those
particular stations deliberately defeating DNS resolution of many
ad generating sites, but I couldn't confirm that with the single
test I tried so far.

.... Ken

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> 
> 
> Daniel
> 
> 
> [1] - https://bugs.freedesktop.org/show_bug.cgi?id=13405
> 
> 
> -- 
> LIVAI Daniel
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