# Re: PowerBook5,8 - TrackPad update

- From: Parag Warudkar \<hidden\>
- Date: 2005-11-29 16:11:09 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2005/11/786379
- Thread: https://ratatoskr.run/lkml/2005/11/786317/t.md

```text

On Nov 29, 2005, at 2:50 AM, Michael Hanselmann wrote:
> The mouse moves, but slowly. Maybe something isn't correct yet, but it
> works basically.

Yeah, mine works like that too - but sometimes it will go left->right when you moved the finger
right->left and vice versa.

> I get 256 bytes in each transfer as well, but didn't look at the bytes
> behind 40. Maybe that'll help to make it more responsive.

Nope, if yours works with 80 bytes, it only sends 80. It will still work with anything > 80 but that's superfluous data.
(E,g, Mine works even with 1024 - anything above 256 seems junk, but with < 256 it dies with EOVERFLOW )

Right now I have detected that byte # 13 increases when moving finger along the bottom from left corner to right,
and byte #11 changes when moved from bottom left corner to top left. Gotta figure out the rest of the movement patterns
along with how many total sensors X and Y are there and how to relate the data to something to report to the input device!

Hopefully Johannes will have a PowerBook with either of the 0x0214 or 0x0215 touchpads
and we will make some headway!

Parag
```