I have noticed that the way my laptop (Dell XPS 13, Ubuntu 16.04, Unity) suspends when I manually order it to (i.e. via the graphical interface or terminal command sudo pm-suspend) is different from the suspension which happens when I close the lid. The most notable difference is that the power button continuously flashes in the second case, but goes completely dark in the first case. Besides that, I think wake-up time is also ever so slightly higher in the lid-close case, but I'm not 100% sure. I'd like to know why these two distinct suspension modes exist at all.
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