On 3/13/18, David Rosenstrauch <darose@xxxxxxxxxx> wrote: > > > On 03/12/2018 09:56 PM, Carsten Mattner via arch-general wrote: >> Any BIOS updates or kernel updates recently (4.15.8)? >> >> Try with 3.16 or 4.9 or another old lts kernel from archive.archlinux.org >> just for testing (not production). >> >> It's more likely that the kernel regressed rather than IRQ issues popping >> up suddenly. It's possible but less likely. > > No BIOS updates. As far as kernel updates, I do those all the time, so > not sure that would be the cause. > > After doing some digging, though, I did "cat /proc/interrupts", and this > line stood out, for having an astronomically high number: > > CPU0 CPU1 CPU2 CPU3 > ... > 16: 2424156658 0 0 0 IO-APIC 16-fasteoi > uhci_hcd:usb5, parport1 > > > I have an old PCI card in the machine that's powers an old parallel port > printer I used to use with it. Perhaps that's failing. I don't need > the card anymore, so I might as well try taking it out and see if that > makes things better. If not, I'll be back. :-) Let us know in either case. Please tell me it's a huge plotter you use to make construction plans for your rocket ships.