Hi @jeremyn54 > the error can be consistently reproduced on both signed and testing kernels.
Reproduced on the test kernel? The one that I built in the ppa? If that's the case, then "usb: handle warm-reset port requests on hub resume" might not be to blame after all. I had a look at your kernel log: > usb usb4-port2: Cannot enable. Maybe the USB cable is bad? The bad device is usb4-port2 in your system. The log's don't show what device this is. It only mentions the root hub, and not the device: usb usb4: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.04 usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb4: Product: xHCI Host Controller usb usb4: Manufacturer: Linux 5.4.0-42-generic xhci-hcd usb usb4: SerialNumber: 0000:00:14.0 We need to know what device is plugged into "port 2" of that hub, i.e. "usb 4-2". Can you try determine what the device is? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1856608 Title: [Regression] usb usb2-port2: Cannot enable. Maybe the USB cable is bad? Status in linux package in Ubuntu: Incomplete Status in linux source package in Bionic: Fix Released Status in linux source package in Disco: Fix Released Status in linux source package in Eoan: Fix Released Status in linux source package in Focal: Incomplete Bug description: This appears to be a regression between 4.15.0-70.79 and 4.15.0-72.81. This bug was fixed by simply reverting the offending change. Bug 1859873 tracks root causing the issue and reapplying the change w/ any necessary fixes. [Impact] USB port unusable and boot time takes ~5 minutes longer to complete. Kernel emits messages like: usb usb2-port2: Cannot enable. Maybe the USB cable is bad? [Test Case] dmesg | grep "Cannot enable" [Fix] [Regression Risk] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856608/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
