On Wed, 25 Jul 2007, Jean-Claude Repetto wrote:
> Hi,
>
> I have a device (a TomTom GPS) that is seen as a memory device when
> connected via USB.
> s
> If I plug the device before booting the PC, it is detected and
> accessible via /dev/sdb .
> But, if I plug the device after the PC has booted, the device is not
> accessible (the /dev/sdb device is not created). Idem if I disconnect
> and reconnect the device.
>
> I am using a x86 Gentoo system with kernel 2.6.22 (but I have also
> tested kernels 2.6.20 and 2.6.21).
>
> I have already asked for help on the Gentoo forums, but I got no useful
> answer. I hope I'll be more lucky here !
>
> BTW, I have tested the same device on the same computer with Ubuntu
> 7.04,
What version of the kernel does that use? Do you have a usb-storage
log showing what happens when you plug the device in after booting?
> and it is working, so it is not a problem with the hardware or the
> device firmware.
It may be a question of the initial delay. If you plug the device in
before booting then it has a long period during which it can
initialize, but if you plug it in later then there's only a 5-second
delay.
You can try increasing the length of that delay. In /etc/modprobe.conf
put a line saying:
options usb-storage delay_use=30
and then rmmod usb-storage. That will increase the delay to 30
seconds. Try various numbers and see if you can find something that
works.
Incidentally, the error code reported in your second log means "Not
ready, medium not present". It's not clear why a GPS unit would say
that, but perhaps it was still busy with its initialization.
Alan Stern
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