Hi ZEROF and thaks for your reply,
1) backbox 3.05 is installed in my samsung n150 plus (I have parted the hd and i have installed backbox, archbang and win xp). I use burg instead of grub.
2) all of them give me that issue (3.5, 3.8, 3.9.2)
- the dinamic cpu frequency is enabled because i can change frequency with all OS (backbox, archbang and win xp)
- i can't find last bios version for my pc on samsung website my model doesn't appear... (the code is NP-N150-JP08IT)
I tryed the new 3.9.3-pf kernel and that message doesn't appear LOL...
It's not a big problem for me... 3.2 kernel works good, the 3.9.3-pf works good too, but I'm curious to solve this problem with 3.8 kernel

no advice?
Thanks again