Re: How to disable power save (iwlwifi / brcmfmac)

[James Prestwood <prestwoj@gmail.com>]

Hi Martin,

On 10/30/24 1:26 PM, Martin Petzold wrote:
> Hi James,
>
> Am 30.10.24 um 21:15 schrieb James Prestwood:
>> Hi Martin,
>>
>> <snip>
>>> Okt 30 21:10:43 tavla iwd[1212]: Wireless daemon version 2.3
>> Your using IWD version 2.3 which doesn't support that.
>
> Okay, thanks. This was another machine (Intel wifi) with not most 
> recent image.
>
> I have tested "PowerSaveDisable=brcmfmac" option on the machine with 
> IWD 2.22+ and it works as expected.
>
> Is this feature actually a IWD featuer or rather a kernel driver 
> feature? Does the brcmfmac driver have something like this, because 
> with modinfo there is no related parameter?

So IWD is just calling a kernel API to set the power save state. Its 
driver agnostic (though it wouldn't surprise me if it didn't work on 
random drivers). Network Manager and iw are both using the same command 
IWD uses to disable power save.

The driver options like for iwlwifi are different, these are disabling 
it at the driver level and those options are driver specific.

>
> However, on the Intel machine I also wonder why the following doesn't 
> work also:
>
> -----
>
> tavla@tavla:~$ sudo reboot
> [...]
> tavla@tavla:~$ cat /etc/modprobe.d/iwlwifi_power_save.conf
> options iwlwifi power_save=0
> tavla@tavla:~$
> tavla@tavla:~$ sudo iw wlan0 get power_save
> Power save: on
>
> -----
>
> Thanks,
>
> Martin
>