I have found that kernel 4.1 actually seems to work fine on my board
(AX370-GK7, F2 BIOS), even when compiled with CONFIG_PINCTRL_AMD=y. Note
that to properly test kernels that old, the correct ACPI device ID needs
to be added as seen in commit
42a4440 pinctrl: amd:Add device HID for future AMD GPIO controller
since otherwise the driver won't find the device.
Anyway, I did that, and there is now a /sys/devices/platform/AMDI0030:00
directory and no obvious complaints in dmesg, so everything seems to be
working as intended as far as I can tell.
I did some bisecting and I am now fairly certain that a regression was
introduced early in the 4.2 cycle with the commit
0be275e x86/irq: Use cached IOAPIC entry instead of reading from
hardware.
I need to do some more testing to make sure I didn't mess up somewhere,
will report back when/if I know more.
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https://bugs.launchpad.net/bugs/1671360
Title:
System doesn't boot properly on AMD Ryzen / Gigabyte GA-AB350-gaming-3
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