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.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1755624 Title: With intel-microcode 3.20180312, kernel reports as broken spectre v2 microcode Status in linux package in Ubuntu: New Bug description: With an intel-microcode package based off of https://downloadcenter.intel.com/download/27591/Linux-Processor- Microcode-Data-File, when booting, the kernel 4.15.0-10.11-generic reports the following in dmesg: [ 0.000000] microcode: microcode updated early to revision 0x84, date = 2018-01-21 [ 0.000000] Intel Spectre v2 broken microcode detected; disabling Speculation Control And indeed, none of ibrs, ibpb, or stibp show up in /proc/cpuinfo. Other testers of the updated microcode report seeing the same thing. The processor this is being tested on is: cpu family : 6 model : 142 model name : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz stepping : 9 microcode : 0x84 The test for the microcode is in https://git.launchpad.net/~ubuntu- kernel/ubuntu/+source/linux/+git/bionic/tree/arch/x86/kernel/cpu/intel.c#n178 ; specifically, it looks like bad_spectre_microcode(c) is returning true. It seems https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d37fc6d360a404b208547ba112e7dabb6533c7fc has not been pulled in yet (though it's staged as 3e442a86b70eea274d01569244584d91e2f287e7 in bionic/master-next and is in 4.15.0-12.13 in bionic-proposed), which addresses things for Kaby Lake processors, but other processers may need to be verified for correctness. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1755624/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp