https://bugzilla.kernel.org/show_bug.cgi?id=214945
Bug ID: 214945
Summary: PCI-E serial card works only with "noapic"
Product: ACPI
Version: 2.5
Kernel Version: 5.10.77
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Config-Interrupts
Assignee: acpi_config-interru...@kernel-bugs.osdl.org
Reporter: cea2me+...@gmail.com
Regression: No
Created attachment 299443
--> https://bugzilla.kernel.org/attachment.cgi?id=299443&action=edit
dmesg
After upgrading the kernel to version 5.10.77, the PCI-E serial card stopped
working. The card driver (mxupcie) builds and loads correctly, but it is not
possible to transmit data between the card ports (/dev/ttyXX). We found that
adding the "noapic" boot argument solves the problem.
The above problem only applies to HPE Proliant DL120 Gen9 servers, because the
same card with the same linux version works fine in another machine.
The problem is not card driver dependent as we tested cards from two different
vendors (MOXA and StarTech) and they both behave exactly the same.
It is also not a problem with the HPE server itself, as the same cards worked
fine on it but with the older kernel version (4.9.258).
Of course, we did not change the configuration of the HPE server (nor BIOS or
Firmware upgrade).
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