I know there are a lot of topics on the synaptics touchpad not working, but I can't seem to find the answer to my problem anywhere. Please forgive me if I missed it.

Here is what happened.
After using the "ambient light" F11 key on my HP laptop (Compaq nc8430), the touchpad was disabled and I couldn't get it to work.
Then I found this thread : "Synaptic touchpad on laptop not working". And Salem's answer totally solved my problem, both for the session fix and for the permanent fix.

But since then, after each reboot I get the same error pop-up, with the following content:

No touchpad found.
No touchpad was found in this system. If the system has a touchpad, please make sure that the synaptics driver is properly installed and configured.
If your touchpad is not found, though the driver is installed and configured correctly, please compile detailed information about your touchpad hardware and report this issue to the issue tracker.

Needless to say, the driver is indeed installed, activated and configured (even though it's kind of useless now, since I guess the .conf file I created is doing all the work).
I know it's a minor issue, because the touchpad does work properly, but it's getting really annoying...

So, could anyone please help me fix this error pop-up problem ? Thank you !