On 17/02/2019 11:28, druck wrote:
> 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.
>

I have broadcom chipsets in my laptop and in my Pi Zero. Both display on
reasonable signal levels and reasonably CONSTANT signal levels massive
variations in wifi speed - from 1Mbps to 54Mbps.

My conclusion is that broadcomm chipsets are total crap - at least under
linux.


--
Future generations will wonder in bemused amazement that the early
twenty-first century’s developed world went into hysterical panic over a
globally average temperature increase of a few tenths of a degree, and,
on the basis of gross exaggerations of highly uncertain computer
projections combined into implausible chains of inference, proceeded to
contemplate a rollback of the industrial age.

Richard Lindzen

--- SoupGate-Win32 v1.05