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Every time I suspend/unsuspend my laptop (Dell XPS 15 9550) I see this kernel log:

Message from syslogd@cruz-XPS-15-9550 at Sep 14 07:58:31 ...
 kernel:[  725.565407] do_IRQ: 5.33 No irq handler for vector

My CPU is Intel i7-6700HQ and I'm with both graphic cards this error happens (intel graphic card or NVidia graphic card).

I've already tried to use a kernel parameter pci=nomsi (this one almost render unusable my machine) and apic=verbose didn't add much info to dmesg output.

With Ubuntu 20.10 (kernel 5.8.0-44-generic) the problem has migrated to:

Message from syslogd@cruz-XPS-15-9550 at Mar  9 16:49:45 ...
 kernel:[23057.190296] __common_interrupt: 5.33 No irq handler for vector

According to the kernel source, 5.33 means CPU 5, IRQ 33.

Flash news!!

On Ubuntu 20.10 something fixed this problem a couple of days ago!

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  • Judging from this thread, it seems some drivers need updating. I have the same problem but haven't tried updating drivers.
    – luchonacho
    Mar 8, 2021 at 15:43
  • Thanks. I have 5.4.0-70-generic and seems latest Stable kernel for Ubuntu 20.04 is 5.4.0-72.80, so will have to wait.
    – luchonacho
    Apr 29, 2021 at 3:22

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