On Sat, 8 Aug 2020 at 08:10, Michael D. Setzer II via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
On 8 Aug 2020 at 9:44, Ed Greshko wrote:
From: Ed Greshko <ed.greshko@xxxxxxxxxxx>
Subject: Re: Missing a CPU after the 5.7 kernels??
To: users@xxxxxxxxxxxxxxxxxxxxxxx
Date sent: Sat, 8 Aug 2020 09:44:02 +0800
Send reply to: Community support for Fedora users
<users@xxxxxxxxxxxxxxxxxxxxxxx>
> On 2020-08-08 09:09, Michael D. Setzer II via users 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.
>
> While it is headless, would there be any chance of booting a live-image to run a 5.6 kernel
> to verify that and older kernel still detects 4?
>
Hooked up a monitor, keyboard, and mouse onto system, and rebooted it.
Unfortunately all of the current kernels where 5.7 version?
Went into advanced options, and found that somehow the CPU settings
for cores was set to manual and the cpu 3 was set to Off??
Machine hasn't had a keyboard setup on it for some time, so no clue how
it got set to manual, and why cpu 3 would have been set to off.
Most systems use a "coin" battery to maintain BIOS settings while powered
down. Unexpected changes after power has been off usually indicate
a failed battery; they are generally easy to replace.
George N. White III
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