https://bugs.kde.org/show_bug.cgi?id=399208
Bug ID: 399208
Summary: Okular has an extemely high latency when scrolling
with a wacom tablet
Product: okular
Version: 1.5.1
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: okular-de...@kde.org
Reporter: keziolio...@gmail.com
Target Milestone: ---
SUMMARY
When scrolling with a wacom tablet, the pages move slower than the input,
accumulating up to dozens of seconds of latency, rendering the software
unusable
STEPS TO REPRODUCE
1. Attach a wacom tablet to the pc
2. Open a pdf document in okular
3. Scroll the document with the wacom tablet and notice the sluggishness
OBSERVED RESULT
I made a video
https://youtu.be/BJEZYtXhhMI
EXPECTED RESULT
It should move the page without latency, I can mind low framerate since i'm
with a 4k screen on intel graphics but this is bad
IMPORTANT: It was working fine at the beginning of this year! So the regression
is somewhat recent
I tried with a new user and on another pc and the problem is confirmed
SOFTWARE VERSIONS
KDE Plasma Version: 5.13.5
KDE Frameworks Version: 5.50.0
Qt Version: 5.11.2
I'm using arch linux so it has always been recent and close to upstream
ADDITIONAL INFORMATION
Looking at ksysguard when okular is moving by itself, I see xorg hogging a cpu
core at 100%, okular is using 2% of the cpu, so is kwin_x11
Wayland is not an option on my setup
--
You are receiving this mail because:
You are watching all bug changes.
