Bug 413186

Summary:	when drawing with tablet pen, most brushes dont seem to work, no lines drawn, at most a point is drawn
Product:	[Applications] krita	Reporter:	maryam.khodaei
Component:	Brush engines	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	albamorales274, halla
Priority:	NOR
Version First Reported In:	4.2.7.1
Target Milestone:	---
Platform:	Other
OS:	macOS
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description maryam.khodaei 2019-10-19 11:46:12 UTC

SUMMARY
the tablet pen of my xp pen artist 12 is working fine, so it seems, but with it i can not use some of the brush tools in krita properly (they do work when i use my computer mouse), just a starting point of the brush works and i can not continue to draw a line with the tool then. So i suspect it has something to do with krita??

STEPS TO REPRODUCE
1. try drawing on a drawing tablet with the basic brushing tools (for instance basic-5 size) also airbrush and eraser
2. 
3. 

OBSERVED RESULT
only the first contact is drawn, afterwards no reaction, and often times not even after that

EXPECTED RESULT
a line should be drawn where the pen is moving on the tablet with every single brush tool

SOFTWARE/OS VERSIONS
Windows: 
macOS: catalina
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Comment 1 Halla Rempt 2019-10-21 08:04:11 UTC

Hi Maryam,

I don't have an xp-pen tablet to test with, but in general, on macOS, problems with tablets are driver problems. Tablets are handled by the OS and the driver, not by individual applications. That said, most tablet driver authors only test with Photoshop, and there are known bugs, like the one with Huion tablets on macOS, where really weird lines go everywhere, but those happened in Corel Painter as well, not just in Krita.

Another problem on macOS happens if two tablet drivers are installed, that confuses the OS completely.

You could try the following: check with the Krita tablet tester applet: see https://docs.krita.org/en/reference_manual/preferences/tablet_settings.html . If that works without problems, we might be able to deduce something from a tablet log: 

* show the log viewer (https://docs.krita.org/en/reference_manual/dockers/log_viewer.html)
* enable logging (left-most button)
* enable tablet logging (right-most button, select tablet logging)
* create an image
* press ctrl-shift-t to enable tablet logging
* make a stroke
* copy the contents of the log viewer in a text file and attach to this bug report.

Comment 2 Bug Janitor Service 2019-11-05 04:33:09 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 3 Bug Janitor Service 2019-11-20 04:33:11 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!