Mir

[wacom] Pen pressure is a little erratic

Bug #1421503 reported by Daniel van Vugt
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Mir
New
Low
Unassigned
mir (Ubuntu)
New
Low
Unassigned

Bug Description

On a wacom sensor (ThinkPad X220T), I can paint in mir_demo_client_fingerpaint using the stylus/pen (and its eraser). Weirdly though the pen tip seems to only alternate between all-on and all-off. Meanwhile painting with the larger softer eraser end gives me a nice wide range of pressure visible in the fingerpaint demo as opacity.

I'm wondering if we're processing the "pressure" value incorrectly, or if this is just an unavoidable hardware issue.

Tags: input wacom
summary: - [wacom] Stylus pressure is a little erratic
+ [wacom] Pen pressure is a little erratic
Changed in mir:
importance: Undecided → Low
Revision history for this message
Robert Carr (robertcarr) wrote : Re: [Bug 1421503] [NEW] [wacom] Pen pressure is a little erratic

One thing im aware of is that max pressure is device specific and needs to
be queried via a device enumeration API (In android and evdev terms, we can
do something different)

On Thu, Feb 12, 2015 at 7:10 PM, Daniel van Vugt <
<email address hidden>> wrote:

> Public bug reported:
>
> On a wacom sensor (ThinkPad X220T), I can paint in
> mir_demo_client_fingerpaint using the stylus/pen (and its eraser).
> Weirdly though the pen tip seems to only alternate between all-on and
> all-off. Meanwhile painting with the larger softer eraser end gives me a
> nice wide range of pressure visible in the fingerpaint demo as opacity.
>
> I'm wondering if we're processing the "pressure" value incorrectly, or
> if this is just an unavoidable hardware issue.
>
> ** Affects: mir
> Importance: Low
> Status: New
>
>
> ** Tags: input wacom
>
> ** Summary changed:
>
> - [wacom] Stylus pressure is a little erratic
> + [wacom] Pen pressure is a little erratic
>
> ** Changed in: mir
> Importance: Undecided => Low
>
> --
> You received this bug notification because you are a member of Mir
> development team, which is subscribed to Mir.
> https://bugs.launchpad.net/bugs/1421503
>
> Title:
> [wacom] Pen pressure is a little erratic
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mir/+bug/1421503/+subscriptions
>

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

I thought it was normalized to [0,1] ... ?

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

See bug 1564830 first now

Revision history for this message
Michał Sawicz (saviq) wrote :

Syncing task from Mir.

Changed in mir (Ubuntu):
importance: Undecided → Low
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