[NBLUG/talk] More USB failures

[Christopher Wagner]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

USB hubs are notorious for causing bizarre problems, I would suggest
removing the USB hub temporarily from the loop and see if that seems to
resolve the issue.  What other devices are connected to your USB ports
on the computer and the USB hub?

- - Chris

Lincoln Peters wrote:
> Still haven't worked out the PDA issues, but this new issue pretty much takes 
> precedent over everything I was working on except SSU classwork...
> 
> This Palm Z22 uses a USB cable both for charging and for sync'ing.  Over the 
> last 36 hours or so that I've been using the USB cable to charge the Z22, 
> I've experienced two failures of the USB controller, both of which could only 
> be fixed by rebooting the computer (this is not the first time I've discussed 
> this issue on the list).  At the time I reboot, if I put my hand next to any 
> of the case fans, I can feel that the air temperature within the case is 
> noticeably higher than outside the case.  Since these failures had pretty 
> much disappeared until recently, I had not given them much thought, but now 
> that I'm taking 19 units at SSU (!), I am way too busy to tolerate ANY 
> preventable hardware failures.
> 
> The Z22 is the only piece of new hardware I've tried to use with this computer 
> within the last 3 weeks, so I'm pretty sure that it is connected to the 
> failures.  However, I connected it to a self-powered (not bus-powered) USB 
> hub, so I wouldn't expect the Z22 to be drawing enough power from the USB 
> controller (or the root hub) to cause it to overheat and shut down (as I 
> suspect is happening).
> 
> This leads to two questions:
> 
> 1. Can one device drawing lots of power from a self-powered USB hub cause the 
> root hub to malfunction due to its high power draw?
> 
> 2. What could I do to protect the USB hardware on my motherboard from 
> overheating, preferably in less than 10 minutes?  I'm thinking I could 
> install a heatsink and fan on the relevant chips, but I'm not sure which 
> chips they are.
> 
> 

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFD35TEr2miaVyTH0ARAjLFAJ9g/cOP18I/RoXk7Uf5D6V9h/5rmgCgxcKf
5DwaJtxSY4u2Og0BhNvL7kU=
=K2DQ
-----END PGP SIGNATURE-----