MSGID: <10h8vep$oq21$3@dont-email.me> 8b22ba69
REPLY: <6bm*d+FtA@news.chiark.greenend.org.uk> c06f328e
PID: PyGate 1.5.2
TID: PyGate/Linux 1.5.2
CHRS: ASCII 1
TZUTC: 0000
REPLYADDR tnp@invalid.invalid
REPLYTO 3:633/10 UUCP
On 09/12/2025 10:46, Theo wrote:
> bp@www.zefox.net wrote:
>> [apologies for the wide lines]
>>
>> Theo  wrote:
>>>
>>> Depending on what kind of device it appears as (serial, keyboard, mass
>>> storage, network, ...) see if you can work out what other app might have
>>> grabbed it.  ('sudo lsof' is handy here, if it appears as a device node
that
>>> you can grep for)
>>
>> Sudo lsof is loquatious, but not obviously informative. These tests were
>> on a Pi5 running up-to-date Bookworm, but the behavior is outwardly the
>> same as Trixie on Pi2.
> 
> What I'm looking for is something having grabbed the USB device. This is
> hard to specify without knowing how the OWON does its USB, but for example
> if it was serial I'd 'lsof | grep /dev/tty' and look for things using the
> /dev/ttyUSB0 or /devttyACM0 device the OWON probably uses.
> 
> Since the OWON app has failed to grab the USB you're looking for other apps
> that have grabbed it, ie not at the OWON app.
> 
> Theo
OOI I discovered a weird thing
IF I have a raspberry PI PICO plugged into my desktop as a power supply 
and running code , then my PC does not detect when the samsung mobile 
phone is plugged in...unless I unplug the PI first...

My friend also reports weird shit with his (PI's) USB. I think it's not 
as rock solid as we sometimes assume.




-- 
There is something fascinating about science. One gets such wholesale 
returns of conjecture out of such a trifling investment of fact.

Mark Twain


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