Messages in this thread | | | Date | Tue, 4 Nov 2008 11:36:24 -0500 (EST) | From | Alan Stern <> | Subject | Re: usb device not showing up |
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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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