Thanks for the post, I adjusted my post by changing "mouse" to "cursor" .. . because usually my problem is happening when typing in laptop, and suddenly the cursor will re-locate to another place, usually back in the body of the text . . . and it will either start typing there, or it will erase everything. Seems to happen mostly in browser, although it did happen in T-bird the other day . . . . So, I'm not seeing it as a graphics problem, I saw a thread in the forum using LM14 where somebody was talking about erratic cursor movement, to "upper left corner of display" and the idea that upgrading the "xserver-xorg-core" file was offered as a solution . . . when I checked a few days ago, mine was as up to date for LM13 . . . I checked it in synaptic.
My cursor is jumping, but not to one place, and mostly within a post window, so it seems like it's an app thing, but it's been in several apps and now thru a number of DE's . . . I have a thread in "Software" called "erractic cursor movement" . . . where I'm listing all the DEs I've checked . . . right now I'm in GNOME classic and the problem hasn't happened . . . yet. I was about to file a bug report, when your post came thru . . . back to my bug report.
MacBookPro5,4 2.53Ghz Core 2 Duo 4GB Ram LM17.1 MATE 64-bit w/ very-humorous Floating Feets!!!