Re: psmouse: "bad data from KBD - bad parity" every 2ms with synaptics touchpad

On Tue, Nov 01, 2011 at 02:34:58PM -0500, Jonathan Nieder wrote:

Damjan Jovanovic wrote:

quoted

Maybe that touchpad doesn't send proper parity. See what we did in commit
6b9d363c49d22395d0cf8729c5963f83cfbb6d69, and try to disable parity
checking for that touchpad the same way?

Sure, though it would be nice to understand the problem better first.

So:

 - Arvind, could you say a little more about when this started
   happening[1]?  Did you change your configuration, or was there any
   upgrade around the same time (/var/log/dpkg.log* should say)?  Any
   idea why this wasn't always happening from the start?

If this was working and then stopped I'd try removing the keyboard and
cleaning and reseating the touchpad connector.

 - Others, any idea what information would be useful to track this
   further?  Are there tools or patches for tracing what the kernel
   gets told by the touchpad, so we could see the nature of these
   parity errors?

Booting with i8042.debug=1 or doing
"echo 1 > /sys/module/i8042/parameters/debug" will dump all data from
the keyboard controller to dmesg. It is quite a bit though (80 pps @ 6
bytes/packet).

-- 
Dmitry