@Milan: I don't doubt that there maybe also be a driver issue, but that
wasn't the root cause of this issue.
@All: It might be helpful to know, for each of these cases, if what you are
seeing is also correlated with the patch we reverted (and are planning to
reintroduce) in older releases. To do so, you could try reverting:
commit 0b6a70743beacb ("usb: handle warm-reset port requests on hub resume").
Alternatively, if you're not comfortable w/ building your own kernel and
the bionic kernel supports your hardware, you could try comparing the
results of 4.15.0-70.79 and 4.15.0-72.81.
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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]
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