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SubjectRe: usb device not showing up
On Tue, 4 Nov 2008, Norbert Preining wrote:

> On Di, 04 Nov 2008, Alan Stern wrote:
> > > - First booting Vista, then RE-booting (not turning it off in the
> > > meantime) into linux gives me that device and everything works.
> >
> > By "it", did you mean the laptop or the modem?
>
> I meant:
> - first booting vista, then re-booting ... the device shows up (and is
> functional)
>
> - booting from off state the device does not show up and cannot be
> switched on using /sys/devices/platform/sony-laptop/wwanpower
> (although the behaviour that it can be switched on using the above
> sysfs file is documented)
>
> > No. I'm interested in seeing the usbmon output for when the modem is
> > first detected by the USB subsystem. During a normal boot this will
> > happen before you can start usbmon.
> >
> > If you can't boot with the modem off, then try this instead: Unload
> > ehci-hcd, uhci-hcd, and ohci-hcd, then start up usbmon (copy the 0u
> > file) and reload whichever driver the modem attaches to.
>
> Ok, I will recompile my kernel with USB as modules and do the above. Is
> there a way to tell the kernel not to load any device drivers/modules
> (probably overriding modprobe in some way)?

You can add entries to /etc/modprobe.d/blacklist. But for temporary
testing, it might be easiest simply to rename the module files
themselves (under /lib/modules/.../kernel/drivers/usb/host) so that the
hotplug system can't find them.

Alan Stern



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