Thanks.
```
$ sudo iw wlan0 set power_save off
```
seemed to work without any errors.
```
$ cat /sys/module/ath9k/parameters/ps_enable
0
```
Yes it returned a zero.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1394163
Title:
Unable to turn powersave for wlan0 off
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