Public bug reported:
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?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2100827
Title:
ubuntu-22.04: Root port link speed degradation to 2.5GT/s after nvme
hot plug
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