Comment # 2 on bug 1227345 from Maxime Thirion

(In reply to Takashi Iwai from comment #1)
> IIRC, there were relevant bugs in the early 6.9.x kernels, and it's been
> fixed in the recent 6.9.x release (around 6.9.4).

If I've understood correctly, with the first buggy kernels the cores appeared,
but tasks weren't always sent to the other cores?

Here, the cores disappeared from the system with kernel 6.9.
Only dmidecode shows me the 4 cores, but only one is activated.

And I have the same problem with the latest kernel available on
MicroOS/Tumbleweed:

cloud:~ # uname -a
Linux cloud 6.9.7-1-default #1 SMP PREEMPT_DYNAMIC Fri Jun 28 05:50:47 UTC 2024
(a5efffa) x86_64 x86_64 x86_64 GNU/Linux

cloud:~ # dmidecode -t processor |grep Core
        Family: Core 2 Duo
        Version: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
        Core Count: 4
        Core Enabled: 1