HP Probook 4515s wi-fi problem

[AxlD]

Hello

I just bought a HP Probook 4515s and I immediately installed Sabayon 5.1. I counter 2 problems.
1) When I boot sometimes before logging to the home screen the pc shuts down! I have to reboot 2 or 3 times until I log in.
2) (And the major problem) Wi-Fi does't seems to work.

Here's a link to laptop wiki http://www.linlap.com/wiki/hp+proboo...ae91e8ad00f28f where these 2 problems are mentioned for my laptop. The editor suggests a fix for Ubuntu but it doesn't seems to do any good for Sabayon.

I hope I started a bew topic in the right section.

Any ideas? Thank you in advance.