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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@xxxxxxxxxxxxxxx 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).




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