I have contacted the developper of synaptic driver, and for sure it's the fault of SCI interrupt handler.
I can reproduce it because I never lose sync when I don't access to /proc/.../temperature and when I access it, exactly at the same time, I lose the sync.

Yu, Luming wrote:

It sound like serious one, if SCI interrupt handler was blamed for this issue.     --Luming

-----Original Message-----
From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org]On Behalf Of Pavel Machek
Sent: 2003?12?2? 2:28
To: roychris
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [ACPI] SCI interrupt handler : spend too much time


Hi!

Since 2.6, when I read /proc/acpi/thermal/THR*/temperature and battery
info, my system spends too much time in SCI interrupt handler and it
loses the sync of my mouse, a synaptic. Any issue ?


Can you repeat it? Losing sync of mouse is probably a bug in inputs,
and should be fixed.
								Pavel