OK - I found a good mention of the problem here. He says “There's a bug relating to the Gaming 5 board where dmesg gets flooded with errors about interrupts unless you disable CONFIG_PINCTRL_AMD.” https://www.reddit.com/r/VFIO/comments/63igfa/horrible_amd_ryzen_performance/
That prompted me to compile a new kernel without the pinctrl-amd option. That option is found when in the kernel configuration utility makeconfig, in the section called Device Drivers/Pin control/AMD GPIO pin control. I used the compiling instructions found here: http://askubuntu.com/questions/163298/whats-a-simple-way-to-recompile-the-kernel I used GIT to download the latest kernel source (4.11.0-rc6) I made no changes to the default kernel configuration other than to check off the pinctrl-amd option. Compiling took over 2 hours, running on only one core! The new kernel unstalled with no problems. acpi=off is no longer necessary to boot, and 16 cores are visible and active in KDE sysguard. No crashes. After installing the new kernel, I tried compiling with the multicore switch, 'make -j 16'. It's pretty impressive to see 16 threads running at 97%. Of course, this is just a temporary fix. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1671360 Title: System doesn't boot properly on Gigabyte AM4 motherboards (AMD Ryzen) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671360/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
