I found a solution with 'acpi=off'.
Now show the correct cpu MHz but doesn't work Frequency Scaling.
:~$ sudo dmidecode -t processor | grep Speed
Max Speed: 2700 MHz
Current Speed: 3051 MHz
:~$ dmesg | grep MHz
[0.00] tsc: Detected 3033.877 MHz processor
vagrale
Same problem.
:~$ uname -a
Linux vagrale-desktop 4.8.0-58-generic #63~16.04.1-Ubuntu SMP Mon Jun 26
17:59:49 UTC 2017 i686 athlon i686 GNU/Linux
:~$ sudo dmidecode -t processor | grep Speed
Max Speed: 2700 MHz
Current Speed: 3052 MHz
:~$ dmesg | grep MHz
[0.00] tsc
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