Description of problem: Xorg server will buserror on sparc because the valc->axisVal is not consistently aligned to 64bit boundaries. Patch to fix the issue is already available upstream and sent to Peter.
From https://bugs.freedesktop.org/show_bug.cgi?id=36119 "I get SIGBUS when moving core pointer on n32 MIPS64 Linux. The architecture requires aligned access to memory. The aborting signal is emitted when accessing v->axisVal[0] in UpdateDeviceState() from Xi/exevents.c." Caused by different allocation schemes in DeepCopyDeviceClasses and InitValuatorClassDeviceStruct. Patch from http://patchwork.freedesktop.org/patch/4924/
xorg-x11-server-1.10.1-8.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/xorg-x11-server-1.10.1-8.fc15
Package xorg-x11-server-1.10.1-8.fc15: * should fix your issue, * was pushed to the Fedora 15 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing xorg-x11-server-1.10.1-8.fc15' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/xorg-x11-server-1.10.1-8.fc15 then log in and leave karma (feedback).
xorg-x11-server-1.10.1-8.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.