Arch Linux

Description:
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Microcode-Update on boot reports revision 0x1b from 2014-05-29 while Intel offers an update 2014-09-13. The current packages has been build on 2014-10-12.

Additional info:
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On boot I get

| [ 0.000000] CPU0 microcode updated early to revision 0x1b, date = 2014-05-29
| [ 0.082057] CPU1 microcode updated early to revision 0x1b, date = 2014-05-29
| [ 0.317017] microcode: CPU0 sig=0x306a9, pf=0x2, revision=0x1b
| [ 0.317021] microcode: CPU1 sig=0x306a9, pf=0x2, revision=0x1b
| [ 0.317027] microcode: CPU2 sig=0x306a9, pf=0x2, revision=0x1b
| [ 0.317032] microcode: CPU3 sig=0x306a9, pf=0x2, revision=0x1b
| [ 0.317072] microcode: Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba

but after I rebuild the package again from source I got, inter alia, these messages

| signature: 0x306a9
| flags: 0x12
| revision: 0x1b
| date: 2014-05-29
| size: 12288
|
| signature: 0x306f2
| flags: 0x6f
| revision: 0x29
| date: 2014-09-03
| size: 28672

Steps to reproduce:
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Compare intel-ucode.img against the current file and that you got after rebuilding the package.

I am not sure if just the wrong revision and date is reported or if we are just on an outdated microcode.