On 11/21, Mihai Dragan wrote: > Thank you, > > systat / vmstat shows an average of 450 interrupts per second constantly > coming from 'acpi0' after cold boot. > I started disabling IO devices from BIOS and it turns out that the smartcard > reader was a red herring: > it's the Thunderbolt 3 controller that seems to be causing this. It's the > only device that stops the issue from reproducing when disabled. > > I tried toggling the available TB3 options available in BIOS, but nothing > makes a difference. > It's interesting that the spurious interrupts are generated regardless if > there's a device plugged into the thunderbolt port or not. > Thunderbolt functionality seems perfectly fine, in both cold and warm boot. > > > On 11/21, Todd C. Miller wrote: > > On Sun, 21 Nov 2021 14:30:09 +0000, Mihai Dragan wrote: > > > > > Can I check from user space the interrupt count a device generates ? > > > Any advice or hints on how to debug this further would be greatly appre > > > ciated. > > > > Compare the output of "vmstat -i" after both cold and warm boot. > > > > - todd > > -- > I'm not the first one to hit this: https://www.kevinthomas.dev/posts/openbsd-thinkpadt480.html
In my case, enabling Thunderbolt BIOS Assist doesn't prevent the spurious interrupts. It does however cause the kernel to crash on shutdown / reboot. I'll keep looking into. --
