[PATCH libinput v4 0/2] Fix Lenovo X230 series touchpad

[Vasily Khoruzhick]

On Thu, Apr 23, 2015 at 1:53 PM, Vasily Khoruzhick <anarsoul at gmail.com> wrote:
> Hi Benjamin,
>
> v4 is completely unusable. With slow motion cursor is _too_ slow, with
> faster it's too fast. First version was _much_ better.

Even more: I'd say non-patched libinput behaves better than v4. Please
commit v1 version.

Regards,
Vasily

> On Mon, Apr 20, 2015 at 9:29 PM, Benjamin Tissoires
> <benjamin.tissoires at gmail.com> wrote:
>> Hi,
>>
>> This is a new attempt to fix the X230 series.
>>
>> This time, I tried to put some more scientific effort, and used gnuplot
>> to try to understand what was happening and how we could catch the same
>> acceleration at high speed than regular touchpads.
>>
>> The results are synthetized in this png:
>> http://people.freedesktop.org/~tissoire/x230.png
>>
>> The red-ish lines are the ones plotted from the regular touchpad acceleration
>> profile for different speed settings (-1.0, 0.0, 1.0).
>>
>> The black one is the one I submitted in the v1 of this series.
>> You can see that the max speed is caught when the input speed is 5, which is
>> not the common use case.
>>
>> So I tried to implement what I wanted to do the first time:
>> - at low speed, slow down the cursor
>> - at high speed (> 2), catch up with the other touchpads
>> - find something acceptable in the middle
>>
>> Not having to use the generic linear pointer acceleration made things much
>> easier to tune, and I ended up with the code in patch 1/2.
>>
>> If other users of the X230 find this acceptable, I propose that we merge this
>> and then we try to tune it later.
>>
>> My believe is that unless we properly filter the incoming events, we won't be
>> able to have a smooth solution. Nevertheless, I feel that these settings
>> should be OK.
>>
>> Cheers,
>> Benjamin
>>
>> Benjamin Tissoires (2):
>>   evdev: use a different filter for low resolution touchpad on the
>>     Lenovo X230
>>   udev: add a custom udev rule for X230 touchpads
>>
>>  doc/device-configuration-via-udev.dox |    9 +++++++
>>  src/evdev-mt-touchpad.c               |   14 +++++++++--
>>  src/evdev.c                           |   23 +++++++++++++++++++
>>  src/evdev.h                           |    7 +++++
>>  src/filter.c                          |   40 +++++++++++++++++++++++++++++++++
>>  src/filter.h                          |    5 ++++
>>  udev/90-libinput-model-quirks.rules   |   14 +++++++++++
>>  udev/Makefile.am                      |    4 ++-
>>  8 files changed, 112 insertions(+), 4 deletions(-)
>>  create mode 100644 udev/90-libinput-model-quirks.rules
>>
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