https://bugs.kde.org/show_bug.cgi?id=357692
Bug ID: 357692
Summary: Choppy screen and mouse movement with Zoom Desktop
Effect
Product: kwin
Version: 5.5.2
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: grave
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: qb...@ungmedms.com
The screen and mouse pointer movement is choppy/blurry when the cursor is
moved. Is very apparent when the cursor is moved fast during very high zoom
levels. It can however be seen as blurry movements at lower zoom levels as
well. This unfortunately makes the zoom effect unusable for people, like me,
who use the zoom all the time to read text.
The issue is likely related to the mousepoll rate. See this comment in
cursor.cpp "// TODO: How often do we really need to poll?". I solved the very
same issue in Gnome Classic (on older hardware) by increasing the mousepoll
speed in compiz. There is no similar setting in KDE.
I suggest a custom mousepoll rate in the zoom effect settings, because the rate
is dependent on the used zoom levels, cursor speed, resolution of the screen
and CPU load. It was discussed in 2013 here:
https://git.reviewboard.kde.org/r/111875/ and was supposed to be solved by
XInput2 but as far as I know it has not been implemented.
Reproducible: Always
Steps to Reproduce:
1. Enable the zoom desktop effect
2. Zoom in to 6x.
3. Move the cursor fast.
Actual Results:
Choppy screen and cursor movement.
Expected Results:
Smooth screen and cursor movement.
Hardware:
Core i7 Broadwell-U-based NUC
Iris Graphics 6100
16 Gb RAM
Reason for high severity level:
I know that this seems to be a minor or perhaps wishlist type of bug. For
people like me however it's not. I simply cannot use a computer all day without
sufficient zoom and I'm not alone. The bigger issue here is that NO current
window manager meets the need of visually impaired users like me. Gnome 3
suffers from the very same mouse poll issue and Unity cannot zoom the dash and
menus.
--
You are receiving this mail because:
You are watching all bug changes.
