I see the same issue on my Skylake desktop (sig=0x506e3). The microcode
updates at startup (microcode: microcode updated early to revision 0xc2,
date = 2017-11-16) but I still get "Intel Spectre v2 broken microcode
detected; disabling Speculation Control". I also tested it on Ivy
Bridge, Broadwell, and another Skylake system (0x406e3) and it works
properly on all those.
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With intel-microcode 3.20180312, kernel reports as broken spectre v2
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