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From: Alexey Borisenkov <grizlik78@gmail.com>
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Date: Wed, 10 Jan 2018 19:52:10 +0400
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10.01.2018 19:08, Maks Re пишет:
> $ dmesg |grep microcode
> [    0.609516] microcode: sig=0x306a9, pf=0x10, revision=0x1c
> [    0.609641] microcode: Microcode Update Driver: v2.01 <tigran@aivazian.fsnet.co.uk>, Peter Oruba

В /usr/share/doc/firmware-intel-ucode-3/changelog последним значится
     sig 0x000306a9, pf_mask 0x12, 2015-02-26, rev 0x001c, size 12288

Так что ревизия 0x1c, скорее всего, наиболее свежая и обновление не 
требуется.

С обновлением лог выглядит примерно так:
[    0.000000] microcode: microcode updated early to revision 0x22, date 
= 2017-01-27
[    0.297978] microcode: sig=0x306c3, pf=0x2, revision=0x22
[    0.298378] microcode: Microcode Update Driver: v2.01 
<tigran@aivazian.fsnet.co.uk>, Peter Oruba