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From: Dmitry Torokhov <dtor_core@ameritech.net>
To: Andres Salomon <dilinger@voxel.net>, linux-kernel@vger.kernel.org
Subject: Re: synaptics mouse jitter in 2.6.0
Date: Tue, 23 Dec 2003 13:37:14 -0500
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On Tuesday 23 December 2003 03:37 am, Andres Salomon wrote:

> [...]
>
> This works a lot better than both -mm1 and stock 2.6.0's mouse behavior
> for me; 2.6.0 likes to drop packets inside the interrupt handler and
> make the mouse jump to the edge of the screen, and 2.6.0-mm1 likes to
> move the pointer between the time I take my finger off the touchpad and
> hit the mouse button.  This appears to fix both issues; however, I
> still see the following in logs:
>
> Dec 23 03:33:53 spiral kernel: Synaptics driver lost sync at byte 4
> Dec 23 03:33:53 spiral kernel: Synaptics driver lost sync at byte 1
> Dec 23 03:33:53 spiral kernel: Synaptics driver resynced.
> Dec 23 03:33:55 spiral kernel: Synaptics driver lost sync at byte 1
> Dec 23 03:33:55 spiral last message repeated 4 times
> Dec 23 03:33:55 spiral kernel: Synaptics driver resynced.
>

That is a known issue with ACPI and i8042 (you do use ACPI, don't you?)
that we were not able to pinpoint yet. The solution that helps a bit is
to poll battery state/tepmerature less frequently.

Dmitry