On Thu, Jun 26, 2014 at 07:50:10PM -0300, João Matos wrote

> I've updated the kernel (3.7.4 to 3.14.4), and the USB problem was solved,
> I don't know why. :)
>
> Now I'm having some other issues, but I've decide recompile the whole
> system before solving them. At least I'm already using my gentoo.

  I would boot with install ISO or rescueCD, chroot, make the necessary
changes and then "emerge system" and "emerge world".  The necessary
changes are...

1) CFLAGS.  I use...
CFLAGS="-O2 -march=native -mfpmath=sse -fomit-frame-pointer -pipe -fno-unwind-tables -fno-asynchronous-unwind-tables"
CXXFLAGS="${CFLAGS}"

CFLAGS="-O2 -march=native -mprefer-avx128 -mvzeroupper -pipe"

that I took from http://wiki.gentoo.org/wiki/Safe_CFLAGS#FX-XXXX . But I'll take a look on these ones.

2) Check your USE flags (in both make.conf and package.use).  I have an
older Dell with an Intel.  I have "mmx mmxext sse sse2 sse3 ssse3" USE
flags.  AMD cpus benefit from "3dnow 3dnowext" and possibly other AMD-
specific flags.

--
Walter Dnes <waltdnes@waltdnes.org>
I don't run "desktop environments"; I run useful applications