Synaptics driver on XO-1.5 hw?

Richard A. Smith richard at
Mon Nov 1 22:17:47 EDT 2010

On 11/01/2010 01:33 PM, Paul Fox wrote:

> martin wrote:
>   >  On Thu, Oct 28, 2010 at 11:01 AM, Daniel Drake<dsd at>  wrote:
>   >  >>  Are there reasons to think Synaptics may now work?
>   >  >
>   >  >  As far as I know there is still no explanation nor diagnosis for the
>   >  >  super-strange EC behaviour in this mode. I don't know if anyone has
>   >  >  tested if the same occurs on XO-1.5.
>   >
>   >  Well, I have now.
>   >
>   >  Works very nicely, does not show any of the scary issues discussed in
>   >  #8901. It may still be spewing too much information, not sure how to
>   >  measure that. EC does not seem to get swamped or confused.
> it's entirely possible that the incremental performance improvements
> that have gone into the EC over time have changed the behavior.  be
> sure to test touchpad sanity while battery is both charging and
> discharging, since it's the battery calculations that can hold off ps2
> bytes from being transferred.

Its good to hear that all the effort Paul and I have been putting into 
refactoring the EC code is paying off.

However, its possible that there might still be some periods where the 
touchpad is blocked for long periods.  To know for sure someone needs to 
watch the clock line on the touchpad interface and see how long its held 

Richard A. Smith  <richard at>
One Laptop per Child

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