[Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter

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https://bugzilla.kernel.org/show_bug.cgi?id=201753

BubuXP (bubuxp@xxxxxxxxx) changed:

           What    |Removed                     |Added
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                 CC|                            |bubuxp@xxxxxxxxx

--- Comment #22 from BubuXP (bubuxp@xxxxxxxxx) ---
Just a note, maybe useless.
I own a Huawei laptop, model KPL-W00D with Ryzen 2500U and it suffer this same
bug.

I cannot compile a kernel so, after installing Devuan testing, I installed also
the generic kernel located here:
https://kernel.ubuntu.com/~kernel-ppa/mainline/daily/2021-03-15/amd64/
that is a 5.12.0 RC3 and it includes the upstream patch for this bug.

The patch works but only on cold boots, after a simple reboot the bug turns
back again.

Maybe it's only a hardware problem, maybe a distro fault or misconfiguration, I
don't know, but I felt compelled to report this.

If needed I can give more detailed informations.

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