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Date: Fri, 31 May 2024 07:26:56 +0000 (UTC)
From: Mohammad Hosain <mh3marefat@yahoo.com>
To: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Message-ID: <127632694.119769.1717140416159@mail.yahoo.com>
Subject: Bug report: AM5 big performance reduction if BIOS Wi-Fi disabled
 and CSM mode enabled
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Hello
Forgive me if this is not the right place to report bugs. I first reported this to stable@vger.kernel.org but they said I should report this to Wi-Fi mailing list...

There is a big performance bug (affecting only gaming performance) on Linux with AM5 boards (at least for my MSI MAG b650 Tomahawk) if these BIOS settings are both applied:

CSM -> Enabled
Wi-Fi -> Disabled (or set to Bluetooth only)

This does not happen even on Win 7 and does not happen if UEFI mode is chosen. Also does not happen if Wi-Fi is disabled through OS and not through BIOS. I've tested with many different BIOS versions all showing the same result.

I have tried troubleshooting with MSI with some benchmarks posted (https://forum-en.msi.com/index.php?threads/b650-tomahawk-bios-bug-disabling-wi-fi-massively-reduces-system-performance.396910/) and after a week we realized this only happens on Linux (tested on Arch/Fedora/Ubuntu with 6.9, 6.8 and 6.5 kernels respectively).