@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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1917203 Title: AMD-Vi: Unable to read/write to IOMMU perf counter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1917203/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
