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If you dive into power saving (energy saving) mode on most computers (and nearly all laptops), you'll see a variety of levels at which you can specify the amount of power savings for wireless adapters (WiFi). These can often be found under "Wireless Adapter Settings".

Choices using generic terminology are typically provided, such as:

  • Maximum Performance
  • Low Power Savings
  • Medium Power Savings
  • Maximum Power Savings

Going beyond these generic terms, what are the specific differences between each of these power savings modes?

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The comments reflect sources that are apparently exclusively concerned with battery-powered devices, and saving energy in batteries. But not all devices are battery-powered; and the power save technology implementations are not all the same. This may lead to issues - perhaps the most common is "laggy" SSH performance. "Laggy" here means that the characters you type into your pty/SSH terminal are not echoed immediately; occasionally taking 5-10 seconds before showing up.

Fortunately, in many applications, the "WiFi power save" features can be disabled. Before doing so, you can check to determine the status of "WiFi power save" (shown enabled below):

iw wlan0 get power_save
Power save: on

If enabled, it may be disabled using the following job in the root crontab:

@reboot /usr/sbin/iw wlan0 set power_save off > /your/logfile.txt 2>&1
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