Good news, folks. I just installed Precise Beta 1 and the bug seems to be fixed. As commented before, probably was a kernel-related issue. So, since - apparently - is not necessary install Precise, would be nice if we get more people testing this to see if this bug is still occurs in the new kernel.
PS: I think that's not necessary install Precise in HDD to test this, because - at least in my case - the bug didn't appear in the boot from USB too.
Good news, folks. I just installed Precise Beta 1 and the bug seems to be fixed. As commented before, probably was a kernel-related issue. So, since - apparently - is not necessary install Precise, would be nice if we get more people testing this to see if this bug is still occurs in the new kernel.
PS: I think that's not necessary install Precise in HDD to test this, because - at least in my case - the bug didn't appear in the boot from USB too.