Subj : USB locking up
To   : Ky Moffet
From : Barry Martin
Date : Wed Sep 23 2020 08:26:00


Hi Ky!

 > Created a script to log some of the (lm-)sensors values to a file:
 > while true; do echo $( date '+%H:%M:%S' ), $( sensors | grep 'V' | sed
 > -r 's/^.* {8}\+(.*)øC  .*$/\1/' )    >>
 >   '/home/barry/Sensors_Log/Log.txt' ;    sleep 0; done
 > Probably sloppy cookbook coding but does what I want: monitor voltages.
 KM> It looks like gibberish to me, so you're ahead! <g>

I have no idea what the stuff is between 'sed' and the redirect '>>' --
that was extracted from the 'cookbook'.  Probably don't need as the
original was for monitoring CPU temperature  -- IIRC the "C" in that
statement should be øC.

Anyway, did plug in a memory card adapter and that made things lock up. 
Yea!!  Unfortunately the Log file was 0 bytes after the reboot.  And of 
course the adapter worked fine after that.



 > Did a test by plugging in a thumbdrive.  Did not cause a lockup (not
 > surprised) but suppose good for a baseline.
 >
 > +12    Started at 12.10 then to 12.05.  Don't think the drop had
 >         anything to do with the insertion and removal of the thumbdrive.
 KM> Probably not.

Thinking not also.


 > +5     Constant 5.01.  Not that the thumbdrive draws that much but
 >         half-figured would vary at least a hundreth of a volt.
 KM> You'd think? Well, here's a thought... maybe voltage is not
 KM> reaching the ports? USB tester is about 4 bucks...

I have previously tested the voltage and appears OK.  OTOH maybe not as 
closely as should: may have been more "yes there is a good 5v output 
[it's not at 4.5]" type of look.  And somehow I half-remember just 
inserting the tester locked it up once -- does have to have data 
pass-through.....



 > Vcore  Did vary but is constanty changing anyway.  0.91. 1.18, 1.27,
 >         1.25, 1.28, 1.12.
 KM> That's CPU voltage; modern CPUs only use what they need at the
 KM> moment.

Right.  Suppose only would be significant if spiked into the 2v range
when a thumbdrive was plugged in.  We're not sure what we're looking 
for. 


 > Will randomly start the script and plug something in to see if can
 > capture a lockup.
 KM> Good, uh, bad luck?

<chuckle>  LIS at the top, did have a lockup but no log file created.  
Not sure if the script was running correctly as I do recall not being 
able to see the filesize for some reason.


 > .. One more time.....which one is Shinola?
 KM> The one that's not shiny. <g>
 
Ah!

 
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