https://bugzilla.kernel.org/show_bug.cgi?id=214021

--- Comment #8 from Chris Chiu (chris.chiu@canonical.com) ---

After lots of experiments, I agree the commit is not the root cause. Since the
commit applied on 5.11 has no problem, but it happens when applying this commit
on 5.4 base.
The confusing part is, I can't reproduce it by enabling the dynamic debug on
xhci-hcd even with the kernel 5.4 base. I'm still trying to find out what
exactly commit cause the difference.

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