On Sat, 8 Aug 2020 at 08:10, Michael D. Setzer II via users < users@lists.fedoraproject.org> wrote:
> On 8 Aug 2020 at 9:44, Ed Greshko wrote: > > From: Ed Greshko <ed.gres...@greshko.com> > Subject: Re: Missing a CPU after the 5.7 kernels?? > To: users@lists.fedoraproject.org > Date sent: Sat, 8 Aug 2020 09:44:02 +0800 > Send reply to: Community support for Fedora users > <users@lists.fedoraproject.org> > > > 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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