Re: [Linuxwacom-discuss] Lenovo Thinkpad Yoga pressure problems

[Jason G. <kil...@gm...>]

The 0xEC sensor has actually been around for a little while (we were
first notified of its presence in the Samsung Slate 7 in late 2011),
so I'm not so sure the pressure range is the problem. Presumably an
overflow would have been seen before in other tablets. Just to be
sure, can you run the following commands for me to double-check the
HID descriptor? Note: the pen will stop working between the two
"modprobe" commands.

$ sudo modprobe -r wacom
$ sudo lsusb -d 056a:00ec -vvvv
$ sudo modprobe wacom

You could also try installing the "xinput" utility to get a dump of
the X11 events our driver is sending. Open a terminal and the program
you're using to draw (GIMP I assume?). In the terminal, run `xinput
--test "Wacom ISDv4 EC Pen stylus"` and then draw a stroke in the
drawing program. Attach the output of both so we can compare the
graphical result with the event dump.

Jason
---
Now instead of four in the eights place /
you’ve got three, ‘Cause you added one  /
(That is to say, eight) to the two,     /
But you can’t take seven from three,    /
So you look at the sixty-fours....



On Sun, Jan 12, 2014 at 3:25 AM, Carl Olsson <car...@gm...> wrote:
> I've just got myself a Lenovo Thinkpad Yoga tablet PC and I'm having
> issues with pressure sensitivity.
>
> What the pressure output looks like with smooth in-and-out strokes:
> http://img.uninhabitant.com/yoga_pressure.jpeg
>
> These newer tablet PCs thend to have an expanded pressure range than
> the older ones, 1024 vs 256 so could the value be overflowing perhaps?
>
> I've tried with drivers from the Linux Mint repos, build from latest
> source package and build from git, all with the same result.
>
> Stylus tracking and buttons both worked fine from the start. Pressure
> works fine in Windows.
>
> I believe the digitiser is of the "Feel It" type.
>
> Output of "xsetwacom --list":
> Wacom ISDv4 EC Pen stylus       id: 11 type: STYLUS
> Wacom ISDv4 EC Pen eraser       id: 15 type: ERASER
>
> Any ideas what's causing this?
>
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