[Bug?] Video viewing progress incorrectly measured when playback speed is faster than normal.

That's weird.  I experimented a couple weeks ago with watching a video on 2x playback speed, and I got the 850 Energy Points after one viewing.  I am using Chrome on Windows.
I wonder whether there is something unusual with either Chromium or Ubuntu, and that they did not test that particular combination.

JaniceHolz Did you view the video as a YouTube embed or the fallback mp4 video (which I viewed) ?

I think I viewed it within the KA website. Is that what you mean by "as a YouTube embed"?

By the way, if you don't get any useful help within a week or so, I would suggest using "Report a Problem" to take it directly to KA staff.

Hi there!

We'd love to have a greater understanding of the issue you're running into while watching our Videos. Could you please submit a support request in our Help Center? Here's the link: http://khan.co/KA-support. 

Thank you for being a part of Khan Academy!