** Attachment added: "downgrade issue" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2100827/+attachment/5861999/+files/down.png
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2100827 Title: ubuntu-22.04: Root port link speed degradation to 2.5GT/s after nvme hot plug Status in linux package in Ubuntu: New Bug description: We found a kenrel issue on Redhat 9.4 and 9.5. nvme pcie link speed will downgrade to 2.5GT/s after hotplug. After analysis, we found this patch casued this issue: a89c82249c37 ("PCI: Work around PCIe link training failures"). This patch also merged into ubuntu 22.04, therefore, this issue will also occur on 22.04. The following commits fix this issue: commit de9a6c8d5dbfedb5eb3722c822da0490f6a59a45 PCI/bwctrl: Add pcie_set_target_speed() to set PCIe Link Speed f68dea13405c94381d08f42dbf0416261622bdad ("PCI: Revert to the original speed after PCIe failed link") Could you help check whetehr ubuntu need add the fix patch on 22.04 version? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2100827/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
