Trackpoint (Dualpoint Stick) too slow, confused

[Simon Thum]

Am 28.04.2010 02:01, schrieb Peter Hutterer:
> 
> sysfs files are for knobs exposed by the kernel.
> 
>> Simple question, asking for the current way to configure:
>>
>> How do I speed up my terribly slow TrackPoint? 
> 
> Simon, do we have anything to speed up devices? looks like everything we
> have is to slow them down...
This intends to preserve precision. I'd bet any speed gains one may have
under another OS is driver magic.

Since sysfs fails, probably acceleration is your friend. The velocity
code wasn't really written with trackpoints in mind but it should work
fine, maybe with tweaks applied.

If the knob is really slow, I'd recommend a profile which ascends early
(like the smooth (soft-knee) limited or linear profile, 6 or 7). You may
also find it helpful to increase "velocity scaling", which adjusts the
profile responses. This can be done with xinput and xorg.conf[.d]

It may take some time to find proper settings; they're documented here:
http://www.x.org/wiki/Development/Documentation/PointerAcceleration

In any case, I'd be interested in how it worked out.

> 
> 
>> It’s called DualPoint Stick, ALPS, is in Lenovo ThinkPad X301. It’s
>> owned by evdev driver.
>>
>> The touchpad is fine, so when I buff the acceleration in Gnome control
>> panel for all devices it becomes super-jerky. I use up-to-date Xorg in
>> Ubuntu Lucid, so please give me the pertinent options for xorg.conf.d
>> stanza.
>>
>> xinput commands weren’t helping at all. They seem to only make things
>> slower [1] – at best, sometimes after playing cursor became attracted to
>> black hole at (1,1). There were references to configure sensitivity via
>> sysfs, but I don’t have these files [2].
>>
>> Would »Option "Resolution"« or »Option "Sensitivity"« help at all? Are
>> they deprecated? man evdev doesn’t mention anything. Can I not buff the
>> sensitivity in the device itself?
> 
> the driver doesn't provide those options, so it wouldn't do much adding it.
>  
> Cheers,
>   Peter
>