Public bug reported:

The problem is simple... the synaptics touchpad doesn't work.
someone claim that modifying the following file and recompiling the Kernel 
would help:

sourcepath/drivers/input/serio/i8042.c

Changing the following routine in the above file:

static int __devinit i8042_check_aux(void)

and adding the line:

return 0;

after the line:

static int i8042_check_aux_cookie;

it was claimed would fix the problem once the kernel had been
recompiled.

Other info here:
http://hp500.xf.cz/us/Main.html

after kernel recompiling the wifi doesn't work  :(

here the workaround (from ubuntuforums):
----------------------------
I got the wifi card working! The problem is that after recompiling the kernel, 
the firmware for the card and other hardware is not copied to a directory with 
the same name as the new kernel.

In order to fix this, you just need to make a symlink in the
/lib/firmware directory that points to the firmware files of the old
kernel.

For example, my old kernel was called "2.6.20-8-generic" and my new
kernel is called 2.6.20-ubuntu1hp500. In that case, I did the following
(as root):

# cd /lib/firmware
# ln -s 2.6.20-8-generic 2.6.20-ubuntu1hp500

-----------------------------------

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
touchpad not working on new laptop HP 510
https://bugs.launchpad.net/bugs/111721
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