Comment 31 for bug 1829620

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Mark (markthecodehamster) wrote : Re: intel-microcode on ASUS makes kernel stuck during loading initramfs on bionic-updates, bionic-security

Hi Steve,

no problem, thank you for digging into this!

> ith the affected processors report the output of:
  iucode-tool -S

# iucode-tool -S
iucode-tool: system has processor(s) with signature 0x000806eb

> is it correct that you are *not* seeing this with 5.0 kernel from the linux-hwe-edge kernel?

no. All Ubuntu kernels with the latest intel-microcode suffer this bug on my HW.
I need to do any of these three workarounds to be able to boot:
1/ use non-ubuntu kernel (I have liquorix)
2/ disable microcode updates during boot: dis_ucode_ldr param
3/ downgrade the intel-microcode package to bionic/main version

> report the output of 'dmesg | grep microcode' when bboted in this configuration to make sure that the initramfs is loading the updated microcode in that case

# uname -a
Linux mmm-U2442 5.0.0-15-generic #16~18.04.1-Ubuntu SMP Tue May 7 14:17:37 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

# dmesg |grep microcode
[ 0.185333] MDS: Vulnerable: Clear CPU buffers attempted, no microcode

(^^^ this is with latest intel-microcode package (from 2019) and the dis_ucode_ldr...so apparently the ucode is not loaded)