From the linked patch notes:

  • Reduced polling rate while the Steam Frame Limiter is active to save additional power. This can save up to 6% on battery life when running at 30fps in a low-power game like HL2
  • amelore@slrpnk.net
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    3 days ago

    Did some more reading, I was probably thinking of broadcast TV signals, which were 25 or 30 fps because one frame is two fields. and I wrongly assumed CRT TVs could only do one thing, but consoles mainly did progressive video.