Bug#551330: xorg: Mouse pointer disappeared after update with default video driver
Same problem here (Intel chipset, happened after huge system upgrade).
I am using GDM and Gnome (Metacity) as desktop environment. My screen
resolution I use in metacity is different than the resolution I have set
when booting (the console) and gdm uses. Although this should not be the
reason as in a new, clean installation of debian testing with gnome
(actual netinst) using the default resolution values in gdm and metacity
this happens, too.
The mouse cursor dissapears after having logged in into gnome.
Switching back to the console and then back to X the cursor reappears again.