Got it, let's figure out how to pull the current TIMEOUT and PERIOD power management values for your wlan0 interface on Raspbian Stretch—since you already know how to set them with iwconfig, let's focus on retrieving those active configurations.

Using iwconfig (your go-to tool) #

The simplest way is to run iwconfig without any modification flags—it will output all current settings for your wireless interface, including power management details.

Just run this in your terminal:

iwconfig wlan0

Scan the output for the line starting with Power Management:. If you've set custom TIMEOUT or PERIOD values, they'll be listed here. For example, if you previously ran iwconfig wlan0 power period 2 and iwconfig wlan0 power timeout 300u all, you might see something like:

Power Management:on
Period=2 timeout=300u

If specific timeout/period values don't show up, that usually means your interface is using the default values set by your wireless driver.

Alternative: iw for more granular details #

Some wireless drivers don't expose all power management parameters via iwconfig. If that's the case, try the iw tool (it's preinstalled on most Raspbian builds) for deeper insights:

To check basic power save state:

iw dev wlan0 get power_save

For more detailed power-related stats (including timeout/period if supported):

iw dev wlan0 station dump | grep -i power

Quick Reference: Setting Commands (for your notes) #

Since you're already familiar with these, here's a cleaned-up list for quick access:

• Set power period: iwconfig wlan0 power period 2
• Set unicast traffic timeout to 500ms: iwconfig wlan0 power 500m unicast
• Set all traffic timeout to 300µs: iwconfig wlan0 power timeout 300u all
• Set power saving level: iwconfig wlan0 power saving 3
• Disable power management entirely: iwconfig wlan0 power off

A quick heads-up: Not all wireless drivers support every power management parameter. If a setting doesn't show up in your iwconfig output after applying it, your driver likely doesn't support that specific option.

内容的提问来源于stack exchange，提问作者Sergio Aiello