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
