$ 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.
Haines Brown
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