Created attachment 122032 [details] An example of the bug, created by writing "Hello World" twice. Mind that I wrote them at max hardness and somewhat slowly. SUMMARY Lines keep shooting out from the point of my pen while I'm trying to draw. STEPS TO REPRODUCE 1. Open a canvas of whatever size. 2. Draw on the canvas. 3. Draw hard or slow, slow down, or pause mid-stroke. OBSERVED RESULT Straight lines appear, pointing in random directions outward from the point of the cursor. EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Linux Mint 19.2 (cinnamon) (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: 5.9.5 ADDITIONAL INFORMATION - Using a Wacom Cintiq 13HD, touch and gestures not enabled. - Settings had to be manually applied via xsetwacom because the Graphics Tablet GUI is broken (caused issues with pen calibration). - This bug does not occur on other art programs such as Drawpile and GIMP. - Krita's "Show system information for bug reports" display is detecting my system as Linux Mint 19.1, when it's really 19.2. Might be related?
[UPDATE] Krita not detecting the os version is apparently not connected, as I managed to fix that bit on my own and the line bug is still occurring; just felt the need to include that after stupidly mentioning it. Also want to retract my assumption that it requires drawing slow to reproduce the bug. I have just experienced the bug while drawing fast.
Can you reproduce this behaviour in older versions of Krita? As it seems this is a performance issue and might be (or not) related to the system. I did some testing and did not get any slowdown or random straight line.
Thanks for the quick reply! Took a little time going through each version starting from 4.2.0. Only 4.2.5 seems to behave like this. Tried 4.2.5 as an appimage as well and it still does it. I guess I'll stick with 4.2.4 for now, until a solution is found of course.
Thanks for your comment! Automatically switching the status of this bug to REPORTED so that the KDE team knows that the bug is ready to get confirmed. In the future you may also do this yourself when providing needed information.
Does this also happen if you switch to another desktop system, like KDE's plasma?
Couldn't test it on KDE (coz it's borked on this machine for some reason--personal issues), but can confirm that the bug still occurs on Openbox and herbsluftwm. I checked to make sure it was only 4.2.5 doing it on them as well, and that is also confirmed.
Hm... Then I'm stumped. I don't see this happening on any of my own test systems, running Windows, Linux/Plasma and macOS, with several different wacom tablets and tablet screens :-( And we didn't have any relevant changes between 4.2.4 and 4.2.5 that I can think of. If you try the tablet tester in krita's settings dialog, does that show the same issue?
Sorry for the late reply! I just tried out the tablet tester and unfortunately, just as I predicted, it didn't seem to show the same issue. I'm wondering if there's some kind of very subtle difference with 4.2.5 that only negatively effects Mint 19.2 specifically...? Or the other way around-- that my own individual install of Mint 19.2 has something wrong... but both of those sound far-fetched. I'm not a programmer anyway, I'm not going to have logical theories.
can you check if this is still relevant in 4.2.9? We did a lot of tweaking everywhere, so it might be this got fixed?
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!
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!