OT: Mouse jumping?
OT: Mouse jumping?
- Subject: OT: Mouse jumping?
- From: Jay Levitt <email@hidden>
- Date: Fri, 07 Nov 2008 13:02:22 -0500
Sorry for the OT post, but I figure X11 users are likely to be picky about
how their mouse works...
Has anyone here seen the mouse cursor pausing and then jumping ahead while
they're moving it, as if the CPU were busy doing something else? I'm on an
8-core Mac Pro (early 2008) with 16GB RAM that's usually about 97% idle, so
that shouldn't ever happen - but it does. I'm running Leopard 10.5.5. This
happens in every app, not just X11.
I've been using a USB Mighty Mouse, plugged directly into the Apple aluminum
keyboard, which plugs directly into the ports on the back of the Mac (no USB
hub). I just switched to a Logitech G9, and it does the same thing. I
usually use it on a black plastic keyboard tray, but I taped white cardstock
down as a mouse pad, and it does the same thing.
It doesn't seem to be random motion; it's always in the direction that I was
moving the mouse. It feels very much like the OS was trying to compensate
for lost data (maybe 100-200ms or so) by estimating where I might have been
moving the mouse during that lost time period.
Has anyone run into this? Can anyone recommend any debugging tools I could
try, maybe something that logs the stream of data from the mouse, or that
logs spin-lock activity when the kernel has to wait unexpectedly, or some
such thing?
Jay Levitt
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