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[Nathan Blair <nathan.blair@xxxxxxxxx>]

I have an Acer Aspire 1420p and experienced the same issues.  Following
the advice in bug #501843, I added "i8042.reset i8042.nomux" to my
kernel command line and now the touchpad is working perfectly.

I first tried it by modifying the command line.  Select the desired kernel and then press 'e' at the grub menu and add "i8042.reset i8042.nomux" (without quotes) just before the "quiet noplash" parameters.  Once I determined that this worked, I made it permanent by modifying the GRUB_CMDLINE_LINUX_DEFAULT value in /etc/default/grub to be:
GRUB_CMDLINE_LINUX_DEFAULT="i8042.reset i8042.nomux quiet splash"

I'm running kernel 2.6.32-22-generic x86_64 on Ubuntu 10.04LTS x64.
dmesg shows the following about my hardware:

Synaptics Touchpad, model: 1, fw: 7.2, id: 0x1c0b1, caps: 0xd04731/0xa40000
input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input9

Hope this helps someone out there.

-- 
[10.04] Touchpad stops working after login
https://bugs.launchpad.net/bugs/549727
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