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 --
