Ubuntu
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  1. Bug #1917203
  2. Comment #4

Comment 4 for bug 1917203

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Alex Hung (alexhung) wrote :

@david,

I cherry-picked 6778ff5b21bd8e78 and built a test kernel @ https://people.canonical.com/~alexhung/LP1917203/. I tested on an AMD Ryzen 5 2500U

Before
[ 0.975812] pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.

After:
[ 1.006639] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported

It would be great if you can give it a try and update the results.