Public bug reported: [Impact] xHCI driver's runtime resume routine tries to reset USB controller with XHCI_RESET_ON_RESUME flag. That causes USB devices connect to the xHCI fail to work.
[Fix] Disable runtime power management regardless of CONFIG_USB_DEFAULT_PERSIST option. [Test] USB devices which connect to the xHCI controller can work normally. [Where problems could occur] USB_DEFAULT_PERSIST is a config for system-wide PM to speed up resume time, so it shouldn't be applied to runtime PM at first place. ** Affects: linux (Ubuntu) Importance: Medium Status: Confirmed ** Affects: linux-oem-5.14 (Ubuntu) Importance: Undecided Status: Invalid ** Affects: linux (Ubuntu Focal) Importance: Undecided Status: Won't Fix ** Affects: linux-oem-5.14 (Ubuntu Focal) Importance: Medium Status: Confirmed ** Also affects: linux-oem-5.14 (Ubuntu) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: linux-oem-5.14 (Ubuntu Focal) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Status: New => Confirmed ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Focal) Status: New => Won't Fix ** Changed in: linux-oem-5.14 (Ubuntu) Status: New => Invalid ** Changed in: linux-oem-5.14 (Ubuntu Focal) Status: New => Confirmed ** Changed in: linux-oem-5.14 (Ubuntu Focal) Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1954369 Title: Fix runtime power management on USB controller with XHCI_RESET_ON_RESUME flag To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1954369/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs