Alan, Thank you for an attempt. :) Interesting findings. Opened Virtual Machine Settings. In hardware, I have chosen USB controller. There are four options there: Enable high-speed support for USB 2.0 devices Automatically connect new USB devices Show all USB input devices Share a Bluetooth devices with virtual machine I marked all 4 of these options. Guess what?! Now the plug-in works! Zoran -----Original Message----- From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] Sent: Thursday, May 10, 2012 7:41 AM To: Stojsavljevic, Zoran Cc: linux-usb@xxxxxxxxxxxxxxx Subject: Re: Interesting problem with gadget drivers on my laptop Lenovo T420! On Wed, 9 May 2012, Stojsavljevic, Zoran wrote: > Hello, > > I have interesting problem, which I don't know how to solve. > > I do the whole setup on the target, and connect target with my desktop. > On my desktop I use VMware with RHEL Guest OS. Once I issue: modprobe > g_zero I see on the desktop usbtest.ko inserted in the list of modules > (hot plug). I also see the USB gadget in /proc/bus/usb/devices . > > I setup the same on my laptop. Interesting enough, although laptop > recognizes USB keyboard and mouse on all ports, it does NOT recognize > hotplug (does NOT insert usbtest.ko) when I issue modprobe g_zero?! > I do not see the USB gadget in /proc/bus/usb/devices . > > I did mounting of usbfs by myself at the beginning on the host side, > issuing (as root):# mount -t usbfs none /proc/bus/usb > > What can be the list of potential problems for such a behavior? Bad electrical connection, bad hardware, ... If you want to get more information, enable CONFIG_USB_DEBUG for the host's kernel and see what shows up in the dmesg log when you plug in the g_zero gadget. Alan Stern -------------------------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen, Deutschland Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr./VAT Registration No.: DE129385895 Citibank Frankfurt a.M. (BLZ 502 109 00) 600119052 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
