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
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
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