I'm experiencing the same issue using a HP dm4-2000sg. Neither in Natty nor Oneiric does scrolling work while in gpointing-devices both the touchpad (called "AlpsPS/2 ALPS GlidePoint") and a PS/2 mouse show up, but no settings in the touchpad section work. Not even disabling it. The workaround found in comment #2 doesn't work for me, unfortunately.
I'm experiencing the same issue using a HP dm4-2000sg. Neither in Natty nor Oneiric does scrolling work while in gpointing-devices both the touchpad (called "AlpsPS/2 ALPS GlidePoint") and a PS/2 mouse show up, but no settings in the touchpad section work. Not even disabling it. The workaround found in comment #2 doesn't work for me, unfortunately.