[Bug 219867] [critical] mouse pointer jumps from the KDE

[Michael Seifert]

https://bugs.kde.org/show_bug.cgi?id=219867

Michael Seifert <mseifert at error-reports.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mseifert at error-reports.org

--- Comment #6 from Michael Seifert <mseifert at error-reports.org> ---
I can confirm this issue. It still persists in KDE 4.9.4.

Description
The symptoms are identical to those of the OP (see also comment #2) with the
exception that the pointer not only jumps to the upper left corner, but also to
the upper and left screen edge, depending on how the mouse is moved after
pausing. Moving it along the y-axis makes it jump to the upper edge, moving it
along the x-axis makes it jump to the left edge and movements in both
directions cause it to jump to the upper left corner.

Solution
After performing the steps suggested in comment #3, during which i had no mouse
pointer issues, i discovered that the threshold for the pointer movement was
set to 0. Setting it to a positive value solved the issue.

Related bugs
I suspected xorg-server to be the cause and found a bug report on
freedesktop.org [1] and tried the suggested fix in comment 11 to no result. A
bug report on launchpad [2] said it might be related to xorg-server 1.13, so i
downgraded which did not fix the issue either. 

[1] https://bugs.freedesktop.org/show_bug.cgi?id=54353
[2] https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1041063

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