I am also experiencing this problem on my XPS M1210 after upgrading from
8.10 to the 9.04 beta. It appears there are several bugs regarding
scrolling with a touchpad, so perhaps they are all related to the
synaptics driver.

Output from dmesg:

mich...@baxter:~$ dmesg | grep input
[    1.466320] input: Lid Switch as 
/devices/LNXSYSTM:00/device:00/PNP0C0D:00/input/input0
[    1.466801] input: Power Button (CM) as 
/devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input1
[    1.466851] input: Sleep Button (CM) as 
/devices/LNXSYSTM:00/device:00/PNP0C0E:00/input/input2
[    1.506590] input: Macintosh mouse button emulation as 
/devices/virtual/input/input3
[    2.030933] input: AT Translated Set 2 keyboard as 
/devices/platform/i8042/serio0/input/input4
[    9.002194] input: Video Bus as 
/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:21/device:22/input/input5
[    9.112490] input: PC Speaker as /devices/platform/pcspkr/input/input6
[   10.116212] input: SynPS/2 Synaptics TouchPad as 
/devices/platform/i8042/serio1/input/input7

I also found this in the output of dmesg when searching for synaptic:

mich...@baxter:~$ dmesg | grep synaptic
[    9.177902] synaptics was reset on resume, see synaptics_resume_reset if you 
have trouble on resume
[ 2279.951457] synaptics was reset on resume, see synaptics_resume_reset if you 
have trouble on resume

Not sure what this means. The scrolling is broken whether it is a fresh
boot or a resume.

Also doesn't appear to be any errors in X's log:

mich...@baxter:~$ tail /var/log/Xorg.0.log
(II) SynPS/2 Synaptics TouchPad: finger width range 0 - 0
(II) SynPS/2 Synaptics TouchPad: buttons: left right middle double triple
(--) SynPS/2 Synaptics TouchPad touchpad found
(**) SynPS/2 Synaptics TouchPad: always reports core events
(II) XINPUT: Adding extended input device "SynPS/2 Synaptics TouchPad" (type: 
TOUCHPAD)
(**) SynPS/2 Synaptics TouchPad: (accel) keeping acceleration scheme 1
(**) SynPS/2 Synaptics TouchPad: (accel) filter chain progression: 2.00
(**) SynPS/2 Synaptics TouchPad: (accel) filter stage 0: 20.00 ms
(**) SynPS/2 Synaptics TouchPad: (accel) set acceleration profile 0
(--) SynPS/2 Synaptics TouchPad touchpad found

-- 
Vertical scroll does not work with touchpad on a Dell XPS M1210 (Ubuntu 9.04)
https://bugs.launchpad.net/bugs/333518
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