According to the stack trace in #3, the error seems to occur when
set_motion calls XGetFeedbackControl.
>From man XGetFeedbackControl:
A BadMatch error will be generated if the requested device does not support
feedbacks. Whether or not a given device supports feedbacks can be determined
by examining the information returned by the XOpenDevice request. For those
devices that support feedbacks, XOpenDevice will return an XInputClassInfo
structure with the input_class field equal to the constant FeedbackClass
(defined in the file XI.h).
Since set_motion (from the gnome-settings-daemon source file gsd-mouse-
manager.c) does not perform this check before calling
XGetFeedbackControl, that is probably the problem.
According to "xinput list --long" the harddisk is a keyboard with mouse
buttons(!):
--------------------------------------------------------------------------------
Western Digital My Book id=9 [slave keyboard (3)]
Reporting 1 classes:
Class originated from: 9. Type: XIButtonClass
Buttons supported: 20
Button labels: "Button Left" "Button Middle" "Button Right"
"Button Wheel Up" "Button Wheel Down" "Button Horiz Wheel Left" "Button Horiz
Wheel Right" "Button Side" "Button Extra" "Button Forward" "Button Back"
"Button Task" "Button 8" "Button 9" "Button Unknown" "Button Unknown" "Button
Unknown" "Button Unknown" "Button Unknown" "Button Unknown"
--------------------------------------------------------------------------------
This probably explains why the problem occurs in a mouse handling function.
To fix the problem, we just have to check if the device supports
feedbacks before calling XGetFeedbackControl. See attached patch for the
gnome-settings-daemon package.
I don't know very much about X programming, so the patch needs review
from someone who knows what they're doing. It seems to work nicely for
me so far, though.
** Patch added: "Patch for the gnome-settings-daemon package"
https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/805894/+attachment/3461641/+files/gsd-check-feedbacks-support.diff
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https://bugs.launchpad.net/bugs/805894
Title:
gnome-settings-daemon crashed with signal 5 in xkl_process_error()
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