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 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/805894 Title: gnome-settings-daemon crashed with signal 5 in xkl_process_error() Status in “gnome-settings-daemon” package in Ubuntu: Incomplete Bug description: Here's a note I included in a similar bug (797947) that may help to diagnose as this might be a timing issue: I'd like to add that I can never get gnome-settings-daemon to start and stay running for more than 5 seconds, UNLESS i take the following actions, in which case it applies the themes properly and responds to theme changes and generally works just fine: 1. start 'strace gnome-settings-daemon' in a window 2. wait until the terminal appears to hang in the middle of the output 3. switch to a virtual console (ALT+F1) and login 4. pkill -9 strace 5. switch back to X - everything is fine! This works about 95% of the time. This is a laptop that always gets this error on boot up and only has one screen, no docking station, so its not anything related to screen size I should think. ProblemType: Crash DistroRelease: Ubuntu 11.10 Package: gnome-settings-daemon 3.1.2-0ubuntu1 ProcVersionSignature: Ubuntu 3.0-2.3-generic 3.0.0-rc4 Uname: Linux 3.0-2-generic i686 Architecture: i386 Date: Sun Jul 3 10:35:32 2011 ExecutablePath: /usr/lib/gnome-settings-daemon/gnome-settings-daemon InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100602.2) ProcCmdline: /usr/lib/gnome-settings-daemon/gnome-settings-daemon ProcEnviron: PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash Signal: 5 SourcePackage: gnome-settings-daemon StacktraceTop: ?? () from /usr/lib/libgdk-3.so.0 ?? () from /usr/lib/libgdk-3.so.0 xkl_process_error () from /usr/lib/libxklavier.so.16 _XError () from /usr/lib/i386-linux-gnu/libX11.so.6 ?? () from /usr/lib/i386-linux-gnu/libX11.so.6 Title: gnome-settings-daemon crashed with signal 5 in xkl_process_error() UpgradeStatus: Upgraded to oneiric on 2011-06-05 (29 days ago) UserGroups: adm admin cdrom dialout games libvirtd lpadmin plugdev sambashare To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/805894/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp