Re: AVX extensions not detected properly on a Zen 2 CPU?

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* Julian Sikorski:

> Am 28.08.23 um 14:39 schrieb Florian Weimer:
>> * Julian Sikorski:
>> 
>>> I have noticed the following message in my kernel log today after I
>>> attempted to decrypt my veracrypt external hard drive:
>>>
>>> [20542.328594] AVX2 instructions are not detected.
>>> [20542.382731] AVX or AES-NI instructions are not detected.
>>> [20542.404097] AVX or AES-NI instructions are not detected.
>>> [20542.560078] AVX2 instructions are not detected.
>>>
>>> My CPU (AMD Ryzen 5 4500U) supports aes, avx and avx2 according to
>>> /proc/cpuid. Is this a bug?
>> What does ld.so --list-diagnostics show?  Is this a virtual machine?
>
> It is not a VM, bare metal Fedora 38 install. It is a ZenBook UM425IA
> laptop.
>
> $ ld.so --list-diagnostics
> dl_dst_lib="lib64"
> dl_hwcap=0x2
> dl_hwcap_important=0x6
> dl_hwcap2=0x2
> dl_hwcaps_subdirs="x86-64-v4:x86-64-v3:x86-64-v2"
> dl_hwcaps_subdirs_active=0x6

That indicates that userspace has access to AVX2 CPU capabilities.
So this must some kernel thing.  Sorry, no idea what is going on.

Thanks,
Florian
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