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Late last year, it was reported that Windows 11 Users Report Performance Issues On AMD Devices With fTPMwhich is when applications in Windows 10 and 11 run with fTPM (A TPM-based software on AMD Motherboard devices). Devices with AMD Ryzen 9 5950X and Asus Prime X570-P motherboards are said to experience stutter when applications start running.
Now regarding this problem, even though initially the problem was limited to Windows only, now the problem is starting to spread to Linux too. Because reportedin Linux kernel 6.1, when hwrng kernel multi-threading (kthread) is enabled, applications start stuttering just like in Windows OS.
Well this issue is of course from AMD’s own drivers, as Mario Limonciello, who is a Key Member of the Technical Staff at AMD, has also recommended users to disable hwrng for fTPM on affected Ryzen(and Athlon) systems as he says:
AMD has issued an advisory indicating that having fTPM enabled in BIOS can cause "stuttering" in the OS. This issue has been fixed in newer versions of the fTPM firmware, but it's up to system designers to decide whether to distribute it.
This issue has existed for a while, but is more prevalent starting with kernel 6.1 because commit b006c439d58db ("hwrng: core - start hwrng kthread also for untrusted sources") started to use the fTPM for hwrng by default. However, all uses of /dev/hwrng result in unacceptable stuttering.
So, simply disable registration of the defective hwrng when detecting these faulty fTPM versions.
Meanwhile, for those of you who don’t use AMD devices, you shouldn’t have this problem, and even this case only occurs on certain AMD devices.
Regarding this problem in Linux, Torvalds will reportedly present a fix this weekend along with the release of Linux Kernel 6.2 which will be presented next Sunday.
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