First, read your default values and remember them:
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cat /sys/devices/system/cpu/cpu0/cpufreq/phc_default_vids
The first Item should be the VID for your highest available ferquency (even if it may not be the highest value).
Now decrease that value by one.
now you have 11 10 8 6
Then write the whole string back (you must be root - sudo does not work; become root with "sudo -s")
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echo "11 10 8 6" > /sys/devices/system/cpu/cpu0/cpufreq/phc_vids
Another way may be to write the highest value from
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cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
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/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
At last run read_msr --readmsr and check if you see your new value on the line "Current VID:".