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    SubjectRe: 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)
    On Fri, Sep 23, 2022 at 09:20:30PM +0200, Grzegorz Halat wrote:
    > 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?

    I think Sean has moved on and isn't available to work this issue.

    To help whoever *can* work on it, would you mind attaching the
    complete dmesg log and "sudo lspci -vv" output for your system? Then
    we can potentially tweak the quirk to not break your system.

    Bjorn

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