[ltp] Alarming boot messages...

[paul marwick]

Richard wrote:

> What that means is the USB hub is reporting excess current draw from 
> connected devices. In general, a USB port may provide only 500mA of 
> current, and connected devices are expected to be "well behaved"*. If 
> you use an unpowered hub, then each branch can only draw 100mA.
>
> lsusb -v will tell you more.
>
>
> I'm guessing you have too many connected USB devices, and inadequate 
> power?

Hmm. That makes it even stranger, since its only occurring during boot, 
when I have no USB devices plugged in. I'll plug in something and see if 
any new messages appear....

> * Each device is allowed to draw 100mA with no interaction. If it 
> wants more (up to 500mA), it must request it from the hub in software, 
> and only take what is granted. Badly behaved devices (eg USB 
> coffee-cup warmers) don't conform to the spec.
I was made a bit nervous by reports of problems with Tx USB, which is 
one of the reasons I asked. I'm very happy with the T40, and don't want 
to have to look for a new mainboard or a replacement laptop..

Thanks for the reply

Regards, Paul