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

bugzilla-daemon
2021-03-15T22:01:06Z

BubuXP (bubuxp@gmail.com) changed:

What |Removed |Added
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CC| |bubuxp@gmail.com

--- Comment #22 from BubuXP (bubuxp@gmail.com) ---
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.