OTG and charging

Help Fairphone 3
,
6

Hello,
very much indeed!

TL;DR: I did not find a suitable solution, I’m sending the hubs back.

So, I tested another USB hub, with the same anecdotal result (no charging). I decided to perform some more rigorous tests. Here’s the parts list:

  • Fairphone 3 :slight_smile:
  • ICZI hub
  • UGREEN hub
  • A DisplayLink USB3 to HDMI adapter I bought in 2015, now at the same URL there’s a new model
  • Lenovo X1 Carbon and its 45W charger
  • A standard phone 5V/1A charger
  • Old TV with HDMI and USB

The test is about the time to discharge the battery from 85% to 80%. The phone was always in airplane mode, screen on, maximum brightness. When the DisplayLink was connected, its app was active, the TV was on and plugged (I mean, I could see the phone’s image* on it).

Configuration 1st test 2nd test
Fairphone 3 alone 28’47" 29’52"
Fairphone 3 + ICZI hub 10’42" 10’41"
Fairphone 3 + UGREEN hub 13’53"
Fairphone 3 + ICZI + DisplayLink 4’18" 5’20"
Fairphone 3 + UGREEN + DisplayLink 6’26" 7’30"
Fairphone 3 + ICZI + DisplayLink + 45W charger 37’45" 28’47"
Fairphone 3 + UGREEN + DisplayLink + 45W charger 27’45" 30’54"
Fairphone 3 + ICZI + DisplayLink + phone charger 28’15" 30’55"
Fairphone 3 + UGREEN + DisplayLink + phone charger 24’30" 27’43"
Fairphone 3 + ICZI + DisplayLink + computer USB 25’37" 27’44"
Fairphone 3 + UGREEN + DisplayLink + computer USB 27’45" 25’38"
Fairphone 3 + ICZI + DisplayLink + TV USB 32’00" 28’50"
Fairphone 3 + UGREEN + DisplayLink + TV USB 30’56" 27’44"

You can see that anything plugged to the charging port of the hubs will help to avoid ultra-fast discharge. Also, in this case, size does not matter! Old TV USB port was enough.

Also, maybe important: even the PC does not charge with these hubs (PC<-hub<-45W charger)! No idea why.

My conclusion: I’m probably better off with some wireless screen sharing.

* In case you’re wondering: no, “Experimental desktop mode” does not work with DisplayLink, it is only mirroring.

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