Kai-Heng,

Am able to see "xHCI host controller not responding, assume dead" pretty
much regularly during suspend/resume.

I verified that the kernel am using has patches mentioned in
https://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=53395
and am using amd platform.

I also have iommu disabled.  Impact being system hangs for a while,
watchdog kicks in and reboot.

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https://bugs.launchpad.net/bugs/1763594

Title:
  xhci hangs; reset results in NULL pointer dereference

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