This bug was fixed in the package linux-oem-5.14 - 5.14.0-1013.13
---------------
linux-oem-5.14 (5.14.0-1013.13) focal; urgency=medium
* focal/linux-oem-5.14: 5.14.0-1013.13 -proposed tracker (LP:
#1955464)
* devices on thunderbolt dock are not recognized on adl-p platform
(LP: #1955016)
- SAUCE: thunderbolt: Runtime PM activate both ends of the device link
- SAUCE: thunderbolt: Tear down existing tunnels when resuming from
hibernate
- SAUCE: thunderbolt: Runtime resume USB4 port when retimers are scanned
- SAUCE: thunderbolt: Do not allow subtracting more NFC credits than
configured
- SAUCE: thunderbolt: Do not program path HopIDs for USB4 routers
- SAUCE: thunderbolt: Add debug logging of DisplayPort resource allocation
-- Chia-Lin Kao (AceLan) <acelan....@canonical.com> Tue, 21 Dec 2021
16:59:25 +0800
** Changed in: linux-oem-5.14 (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1954369
Title:
Fix runtime power management on USB controller with
XHCI_RESET_ON_RESUME flag
Status in HWE Next:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.14 source package in Focal:
Fix Released
Bug description:
[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.
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