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  • Posts: 2
  • Registered: ‎07-24-2017
  • Location: FR
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BIOS 1.29 for T450: microcode update ?

2017-07-24, 13:40 PM



the changelog of the BIOS 1.29 states that it contains an update of the CPU microcode.

Afetr I upgraded successfully to that new BIOS, I've been surprised to notice that the microcode wasn't updated.

Booting on lunix, I can see that the CPU is still running the old revision 0x24 of the microcode:


[ 3.081408] microcode: sig=0x306d4, pf=0x40, revision=0x24
[ 3.081446] microcode: Microcode Update Driver: v2.2.


I expected to find the revision 0x25 which was released by intel several months ago (see: http://metadata.ftp-master.debian.org/changelogs/non-free/i/intel-microcode/intel-microcode_3.20170511.1_changelog)


By comparing the line below extracted from that link to the boot message I reported above, you can verify the CPU signature and the processor flag mask associated to that microcode update perfectly match my CPU.


sig 0x000306d4, pf_mask 0xc0, 2017-01-27, rev 0x0025, size 17408


So I wonder why that micocode update was not included in the BIOS 1.29.

Is it a mistake ? or did Lenovo have a good reason to omit it ?

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