On Fri, 13 Jul 2007, Haines Brown wrote: > $ uname -a > Linux teufel 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 UTC 2007 i686 > GNU/Linux > > I have a camera (Canon A510) that until recently could be accessed by > gphoto2, but now it is no longer seen on the bus. In syslog/kernlog, > there is no message when the camera is attached or detached. In > various gphoto2 debug messages, the camera not seen. The camera was > working with my computer in the past couple of weeks, and I don't > recall having done anything that might affect it. > > I assume that there are several possible reasons why the USB bus won't > show a device: a) the camera has to be powered up, b) the USB bus has > to be functional, c) the right drivers must be loaded, and d) device > hardware must not be broken. > > a) I connect the camera via the usual USB cable to an external USB hub, > plug in the external power, and I switch the camera on. > > b) The bus works with other devices, both on the root hub and extenral > hub. I changed the usb cable and plugged it into a different port on my > hub, but that didn't help. > > c) For my camera, I suspect all I need are the usual usb modules: > > $ lsmod | grep usb > usb_storage 71840 0 > usblp 12768 0 > scsi_mod 124168 6 usb_storage,sbp2,sd_mod,libata, > aic79xx,scsi_transport_spi > ide_core 110504 4 usb_storage,ide_cd,amd74xx,generic > usbcore 112644 5 usb_storage,usblp,ohci_hcd,ehci_hcd > > d) What are the odds that the camera itself has broken? Is there > anything I might do to narrow the range of possibilities? I'm not > anxious to replace the camera and then find out that the problem > remains.
To get more information, build a kernel with CONFIG_USB_DEBUG turned on. Then post the dmesg log showing what happens when you plug in the camera. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
