Comment 1 for bug 989981

I can return it to proper functioning by removing and replacing the psmouse kernel driver.
When I do so, these messages appear in the dmesg log:

[ 1639.710729] psmouse serio2: synaptics: Touchpad model: 1, fw: 7.2, id: 0x1c0b1, caps: 0xd04733/0xa40000/0xa0000
[ 1639.780224] input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio2/input/input10

If it is possible that this is a hardware issue, my hardware is a Dell Inspiron 1750 laptop. I am only aware of this problem affecting the touchpad scroll.