On an ext3 partition, some space is reserved for root's use only. When all space for normal users is full and there is still disk activity (root is installing files or as a user I am moving files to another partition to make more room), the mouse goes crazy. It flies all over the screen and randomly clicks on things. It resizes windows, closes things, and even once locked the console (by clicking on the correct thing in KDE). The mouse I use is imps2 on dev/psaux. All system stuff and /home are on the same partition (/dev/hda7). This has happened three times so far, once in twm and twice in KDE. The only thing the episodes have in common is that the user portion of the drive was full and root was installing something.
Ammendment: It doesn't just happen when the disk is nearly full. Today it happened when I untarred a large (9 MB) tar file.
Are you still experiencing this using a more current version of xorg?
IMHO, this doesn't sound like a xorg related problem. Closing as NOTOURBUG.
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