Question on uvcvideo driver's power management: Q1: We found some USB material mentioned : Relationship between ACPI Dx states and USB PM states (active/suspended) is orthogonal. Suspend/resume might not effect device Dx state(e.g. D0/D1/D3). Is it a correct statement for general usb device and uvcvideo usb device? Q2: How to tell USB uvcvideo device’s ACPI Dx state. It seems lsusb can’t tell us those info. (lspci works for PCI device’s Dx state) Q3: How to tell USB uvcvideo device’s suspension state? will any query via urb will cause resume of uvcvideo device? Q4: should USB uvcvideo device driver response to do some device-specific power action (e.g. device register writing) to put a specific USB camera into low power state when responding to suspend action? (I didn't find such device-specific power code inside uvcvideo src code) Q5: If Q4 is Yes, should device vendor respond for those device-specific code?
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