Power Management: WiFi - experience with that?

General
#1

Hi, considering the section → Power_Management, I’d like to get more information about WiFi.

I get the following output:

[defaultuser@Xperia10III ~]$ iw dev
phy#0
Interface p2p0
	ifindex 15
	wdev 0x2
	addr 3e:01:ef: ...
	type P2P-device
Interface wlan0
	ifindex 14
	wdev 0x1
	addr 3c:01:ef: ...
	ssid FRITZ!Box_2,4
	type managed
	txpower 34.00 dBm

If I would use something like “iw phy phy0 set txpower fixed 15”, do you think It would save significant battery power?
Perhaps I’ll test using internet radio for some time with the original txpower and the same time with reduced txpower

(Related to: → Battery Buddy / energy saving)

#2

I believe iw replaces iwconfig

#3

The default config of my Xperia 10 III was:

[defaultuser@Xperia10III ~]$ iw reg get 
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 40), (N/A, 20), (N/A), PASSIVE-SCAN
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(5250 - 5330 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(5490 - 5710 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)

phy#0 (self-managed)
country US: DFS-FCC
(2402 - 2472 @ 40), (6, 30), (N/A), AUTO-BW
(5170 - 5250 @ 80), (6, 24), (N/A), AUTO-BW
(5250 - 5330 @ 80), (6, 24), (0 ms), DFS, AUTO-BW
(5490 - 5730 @ 160), (6, 24), (0 ms), DFS, AUTO-BW
(5735 - 5835 @ 80), (6, 30), (N/A), AUTO-BW

Test: Streaming internet-radio over Wi-Fi (speaker off, display off) for 2.0 h decreased battery: 8%

After that I changed my settings, because I’ve a very good Wi-Fi coverage at work and at home:

[root@Xperia10III defaultuser]# iw reg set DE 
[root@Xperia10III defaultuser]# iw dev wlan0 set txpower limit 15

Test 2: Streaming internet-radio over Wi-Fi (speaker off, display off) for 2.0 h decreased battery: 7%
Obviously the difference is minimal or perhaps by chance; but reduced limit over the whole day could save some energy.