Re: boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets)

[Grzegorz Halat]

Hi,

On Wed, Sep 16 2020 at 12:12, Stefan Bühler wrote:
> this quirk breaks our serial ports PCIe card (i.e. we don't see any
> output from the connected devices; no idea whether anything we send
> reaches them):

I have the same problem, also with a PCI serial adapter from Oxford Semiconductor.
I've bisected the kernel and it was introduced in b88bf6c3b6ff.
When the system is booted with "pci=noioapicquirk" then the PCI card works fine.
The CPU is Intel Xeon E5-2680 v3 @ 2.50GHz.

Sean, do you have any news about this issue?

Grzegorz