opportunistic suspend article on LWN

[Peter Robinson]

I know we do this (or similar) on the XOs, it seems there's a
discussion on it upstream. Not sure if its worth reviewing to ensure
our requirements are met as part of that. I know it won't affect us
now but we know its something that will likely come and bite us later,
might be worthwhile if that was in a good way. It might not even
impact us :)

https://lwn.net/Articles/463517/