On Fri, 7 Aug 2020 at 22:09, Michael D. Setzer II via users < users@lists.fedoraproject.org> wrote:
> Have a old quad core system that I've had since Fedora 10 I believe. > Recently, upgraded to Fedora 31, and it was still seeing all 4 cores. > > Run BOINC, and recently notice that it was only showing 3 cpus > running? Machine is one of the 5 computers I have at house, but is > headless and access remotely via VNC. Other systems all show the right > number of cpus after updates, so not sure what might cause the issue. > The results of lshw-gui shows the 4 cores, but the dmesg shows only > CPU 0 - 2. Didn't notice this until the 5.7 kernel change, but not sure > exactly which update caused the change. > > Any ideals what could fix this, or how to get specific reasons it might > have happened. Other machines are newer, some dual and one other > quad core. So, just this one?? > There is a long thread that seems relevant: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2221826.html > This is not a 5.8-rc3 problem. Almost all AMD CPUs and APUs are > looking like this. > The only CPUs I own are getting that right is a dual EPYC box, > everything else is broken > regarding the right C/T & socket(s) count, and that probably bc is > using NUAM [sic] code > to have the info. Hardware failure? [ 10.196935] k10temp 0000:00:18.3: unreliable CPU thermal sensor; monitoring disabled See: https://wiki.archlinux.org/index.php/Lm_sensors for discussion of this message. Having seen too many older systems act up with failed capacitors, I'd check the system board for bad capacitors and signs of overheating. -- George N. White III
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