#StackBounty: #linux #linux-kernel #hardware #gentoo #amd AMD microcode not updating

Bounty: 50

I have recently installed Gentoo Linux on my AMD Ryzen 7 1700X.
Now I face segmentation faults during heavy compilation loads and also random restarts in an idle state.

As a very first step I verified the current microcode version:

grep -m 1 microcode /proc/cpuinfo
microcode       : 0x8001126

However, according to this table the latest microcode should be 0x08001129.
It thus seems to be a good idea to update the microcode for the CPU.

So I emerged =sys-kernel/linux-firmware-20180730 (containing /lib/firmware/amd-ucode/microcode_amd_fam17h.bin).
Further, I enabled the following options in the kernel:


After a reboot, I tried loading the microcode manually (late microcode update):

echo 1 > /sys/devices/system/cpu/microcode/reload

However, when I do this, no new line appears in dmesg:

dmesg | grep microcode
[    0.465121] microcode: CPU0: patch_level=0x08001126
[    0.465514] microcode: CPU1: patch_level=0x08001126
[    0.465932] microcode: CPU2: patch_level=0x08001126
[    0.466394] microcode: CPU3: patch_level=0x08001126
[    0.466772] microcode: CPU4: patch_level=0x08001126
[    0.467159] microcode: CPU5: patch_level=0x08001126
[    0.467537] microcode: CPU6: patch_level=0x08001126
[    0.467908] microcode: CPU7: patch_level=0x08001126
[    0.468268] microcode: CPU8: patch_level=0x08001126
[    0.468653] microcode: CPU9: patch_level=0x08001126
[    0.468999] microcode: CPU10: patch_level=0x08001126
[    0.469409] microcode: CPU11: patch_level=0x08001126
[    0.469744] microcode: CPU12: patch_level=0x08001126
[    0.470136] microcode: CPU13: patch_level=0x08001126
[    0.470455] microcode: CPU14: patch_level=0x08001126
[    0.470757] microcode: CPU15: patch_level=0x08001126
[    0.471092] microcode: Microcode Update Driver: v2.2.

I would expect something like microcode: CPU0: new patch_level=0x08001129.
What am I missing here?
Some kernel CONFIG_ option?
Can I turn on some sort of debug information?
Or even better – how can I list the microcode version provided in microcode_amd_fam17h.bin?

Get this bounty!!!

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