[PATCH 0/3] Make the touchscreen filtering optional.

Nelson Castillo arhuaco at freaks-unidos.net
Thu Jan 29 08:56:06 CET 2009

On Thu, Jan 29, 2009 at 2:47 AM, Andy Green <andy at openmoko.com> wrote:
> Hash: SHA1
> Somebody in the thread at some point said:
> | I neither think that the new kernel is slower in analyzing the
> | touchscreen events. Simply it uses too strong filters imho.
> Fine, I saw your other post -- thanks for trying it under more
> controlled circumstances -- with specific description and we will look
> at reproducing and tuning the performance for that case.

I'm working on it right now. I noticed what is affecting him. It is
the 60 milliseconds timeout that we have to avoid jitter. Since the
ilume keyboard has some inertia it thinks that the user is actually
pressing the key and that key will take more time to return to its
normal position.

I tested with 2.6.24 and with 2.6.28 and i see an improvement in
accuracy in 2.6.28, and 2.6.24 is no better than 2.6.28 in terms of

I tried a smaller interval (about 15 milliseconds) for the jitter
problem and things work better. I'll do more tests and send a patch. I
would like to do what you suggested earlier (faster conversion rate
for initial events), I am doing tests now.


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