Wifi sleep - Printable Version

Wifi sleep - Printable Version

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+--- Thread: Wifi sleep (/showthread.php?tid=1091)

Wifi sleep - Sandorra - 02-14-2019

Wifi only Raspberry zero W looses wifi connection after hours / days.

iwconfig in terminal gives reply stating:
Power Management:on

So I did:

sudo nano /etc/rc.local

and added (just above exit 0):

iwconfig wlan0 power off

Saved, rebooted and now wifi is stable.

I Think this should be standard behaviour or a setting in the web interface: disable wifi sleep.

RE: Wifi sleep - Tim Curtis - 02-14-2019

Hi,

Very odd. I've never seen WiFi "go to sleep" on my ZeroW.

Does your WiFi connection drop while the UI is open or music is playing?

Below is some data from the ZeroW which has been up for over 4 days continuously and no WiFi issues.

Top part of System info

Code:
         S Y S T E M    P A R A M E T E R S  

        Date and time   = 2019-02-14 07:20:28

        System uptime   = up 4 days, 22 hours, 59 minutes

        Timezone        = America/Detroit

        Release         = moOde 4.5 2019-MM-DD

        Update          = None

        Host name       = rp2

        ETH0  IP        = unassigned

        ETH0  MAC       = no adapter

        WLAN0 IP        = 192.168.1.172

        WLAN0 MAC       = b8:27:eb:7c:97:0d

        WiFi country    = US

        HDWR REV        = Pi-Zero W 512MB v1.1

        SoC             = BCM2835

        CORES           = 1

        ARCH            = armv6l

        RASPBIAN        = 9.6

        KERNEL          = 4.14.92+

        KTIMER FREQ     = 100 Hz

        USB BOOT        = not available

        Warranty        = OK

From Network config screen

Code:
192.168.1.172 - quality 81%, level -53 dBm

RE: Wifi sleep - Sandorra - 02-14-2019

Only service used is AirPlay, no mpd, samba or other services keeping the wlan0 awake.
The WiFi does nog log its state to syslog or Any other log i am aware off.

Iwconfig is the only way to tell if power management is disabled or not.

Confusing thing is that “wlan0 power on” is short for “wlan power management on”. And that means WiFi will be off after few Hours of netwerk inactivity.

Statistics, now with uptime of 7 hours and counting:

S Y S T E M P A R A M E T E R S

Date and time = 2019-02-14 17:04:38
System uptime = up 7 hours, 42 minutes
Timezone = Europe/Amsterdam
Release = moOde 4.4 2018-12-09
Update = 2018-12-19

Host name = zolder
ETH0 IP = unassigned
ETH0 MAC = no adapter
WLAN0 IP = 192.168.2.99
WLAN0 MAC = b8:27:eb:f5:68:e3
WiFi country = NL

192.168.2.99 - quality 96%, level -43 dBm

RE: Wifi sleep - TheOldPresbyope - 02-14-2019

As of two years ago, power management of the onboard WiFi transceiver has been disabled in the kernel https://github.com/raspberrypi/firmware/commit/8b4e5482b52e6fb438dddc0d88ba0ba8d44af54b

You can confirm this by looking at dmesg output

Code:
pi@moode45k2:~ $ dmesg|grep power

[   17.687733] brcmfmac: power management disabled

In the words of @DougieWatson (he's one of the core RPi developers), https://www.raspberrypi.org/forums/viewtopic.php?t=194619#p1239465

Quote:For the RPF built-in Broadcom (aka Cypress) WiFi/BT there's no control for power management. It's disabled by the kernel and the only thing you're seeing is a bug in the iw / iwlist / iwconfig commands.

Regards,
Kent

RE: Wifi sleep - DRONE7 - 02-14-2019

Quote:@DougieWatson (he's one of the core RPi developers)

and here he is on walkabout contemplating wifi power management......oops Big Grin

https://www.google.com/imgres?imgurl=https%3A%2F%2Fc8.alamy.com%2Fcomp%2FGH5J1X%2Fqueen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-GH5J1X.jpg&imgrefurl=https%3A%2F%2Fwww.alamy.com%2Fstock-photo-queen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-113835286.html&docid=zm4hn0qEiCQsUM&tbnid=4C6DCYQjJW7DaM%3A&vet=10ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA..i&w=1071&h=1390&client=ubuntu&bih=922&biw=1920&q=DougieWatson&ved=0ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA&iact=mrc&uact=8

I think Kent means the acerbic @DougieLawson.... Wink

RE: Wifi sleep - TheOldPresbyope - 02-14-2019

(02-14-2019, 06:18 PM)DRONE7 Wrote:
Quote:@DougieWatson (he's one of the core RPi developers)
and here he is on walkabout contemplating wifi power management......oops
https://www.google.com/imgres?imgurl=https%3A%2F%2Fc8.alamy.com%2Fcomp%2FGH5J1X%2Fqueen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-GH5J1X.jpg&imgrefurl=https%3A%2F%2Fwww.alamy.com%2Fstock-photo-queen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-113835286.html&docid=zm4hn0qEiCQsUM&tbnid=4C6DCYQjJW7DaM%3A&vet=10ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA..i&w=1071&h=1390&client=ubuntu&bih=922&biw=1920&q=DougieWatson&ved=0ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA&iact=mrc&uact=8

I think Kent means the acerbic @DougieLawson....

Another sign of the dreaded Old-Timers disease, perhaps.

RE: Wifi sleep - Tim Curtis - 02-14-2019

lol

RE: Wifi sleep - DRONE7 - 02-15-2019

(02-14-2019, 06:18 PM)DRONE7 Wrote:
Quote:@DougieWatson (he's one of the core RPi developers)
and here he is on walkabout contemplating wifi power management......oops
https://www.google.com/imgres?imgurl=https%3A%2F%2Fc8.alamy.com%2Fcomp%2FGH5J1X%2Fqueen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-GH5J1X.jpg&imgrefurl=https%3A%2F%2Fwww.alamy.com%2Fstock-photo-queen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-113835286.html&docid=zm4hn0qEiCQsUM&tbnid=4C6DCYQjJW7DaM%3A&vet=10ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA..i&w=1071&h=1390&client=ubuntu&bih=922&biw=1920&q=DougieWatson&ved=0ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA&iact=mrc&uact=8

I think Kent means the acerbic @DougieLawson....

Yeah, strange as I thought "That's Liz he's talking to but I don't think it's our Liz Upton" ... Exclamation

RE: Wifi sleep - TheOldPresbyope - 02-15-2019

(02-15-2019, 06:45 AM)DRONE7 Wrote:
(02-14-2019, 06:18 PM)DRONE7 Wrote:
Quote:@DougieWatson (he's one of the core RPi developers)
and here he is on walkabout contemplating wifi power management......oops
https://www.google.com/imgres?imgurl=https%3A%2F%2Fc8.alamy.com%2Fcomp%2FGH5J1X%2Fqueen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-GH5J1X.jpg&imgrefurl=https%3A%2F%2Fwww.alamy.com%2Fstock-photo-queen-elizabeth-ii-with-major-dougie-watson-royal-guard-commander-113835286.html&docid=zm4hn0qEiCQsUM&tbnid=4C6DCYQjJW7DaM%3A&vet=10ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA..i&w=1071&h=1390&client=ubuntu&bih=922&biw=1920&q=DougieWatson&ved=0ahUKEwjo18rm6bvgAhXCeisKHVdgBpIQMwg7KAAwAA&iact=mrc&uact=8

I think Kent means the acerbic @DougieLawson....

Yeah, strange as I thought "That's Liz he's talking to but I don't think it's our Liz Upton" ...

In my defense, I knew a Dougie Watson at school more than half a century ago. That's why I think this curious event resulted from OTD (Old Timers Disease).

My Dougie didn't look anything like the Fusillier, though, whereas Liz looks just like my mother-in-law, who knew nothing about WiFi power management Tongue

Regards,
Kent