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
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https://bugs.launchpad.net/bugs/1954369
Title:
Fix runtime power management on USB controller with
XHCI_RESET_ON_RESUME flag
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