On Tue, Sep 06, 2022 at 05:59:49PM +0300, Mika Westerberg wrote: > This reminded me that in Intel hardware there is an ACPI power resource that is > shared between related devices. IIRC there is _PR0() method under the root > port, xHCI and the TBT NHI that returns the same power resource. Now, when the > power resource is turned on for any of the devices the kernel wakes up the rest > too to make sure they get properly re-initialized if they went into > D0unitialized or something like that. The commit that added this is > 4533771c1e53 ("ACPI / PM: Introduce concept of a _PR0 dependent device"). Probably has nothing to do with this actually.