I'm new in Sabayon linux , I try to update from 3.7 kernel to 3-7.4 using kernel switcher methode all seems good , when execute exelect kernel list only the cirrent one is shwoing not the new one , any help plz ?
If you upgraded your kernel to 3.7 with kernel-switcher and ran your entropy updates and upgrades, you are running the 3.7.4 kernel. eselect kernel list will still show something like  linux-3.7.0-sabayon * but equo query -vq installed linux-sabayon shows the actual version/revision: sys-kernel/linux-sabayon-3.7.4. You don't have to use kernel-switcher to upgrade the kernel from 3.7 to 3.7.4 this will be done by a regular entropy update/upgrade. But you will need the kernel-switcher to upgrade to 3.8 once released.