On 17/02/2019 11:19, Markus Robert Kessler wrote:
> I always wondered why I can only hardly get a connection to my WiFi
> router when running Rasperries -- Zero up to 3B+ -- in desktop mode, but
> there were no WLAN issues when running as ssh server.
>
> For doing this I formerly used an HDMI2VGA adapter (cheap 10 $ thing) and
> it did work. But I recognized that it got really warm, and so, I
> suspected that this energy came from the PC and not from the monitor.

Connecting anything to the HDMI port causes an increase in power usage.
A few of my Raspberry Pi's are connected to TV's, and I see an increase
in SOC temperature of 4C when they are switched on.

> I measured USB voltage output and found out that connecting this "adapter"
> will cause the output to go from around 5.2 V to 5.1 or below.
>
> This seems to significantly interfere with the internal WiFi module, and,
> hence, when connecting the monitor with the Raspberry using a "normal"
> HDMI-to-HDMI cable with no conversion, then the problems connecting to
> WLAN router were gone.

I've not noticed any issues with the internal WiFi and just a TV
connected, but a HDMI powered dongle would be likely to affect it more
than just a TV.

---druck

--- SoupGate-Win32 v1.05