Subj : Slackware 10.0 USB Hotplug Problem
To   : comp.os.linux
From : a.nuzzo
Date : Mon Sep 06 2004 08:32 am

I am having a problem getting the USB hotplug to work for my digital
camera (Minolta F300 - usb storage). I am running Slackware 10.0.  It
worked fine with the default kernel (2.4.26) but when I upgraded to
the 2.6.7 kernel that comes with Slackware it would no longer detect
the camera when it is attached.  Also, it does not show up if I do an
lsusb or show up in procs.

If I attach the camera and turn it on and then start the computer it
will find it and will mount without any problems. It will also show up
in lsusb and in procs. If you unmount the camera and turn it off it
will detect that the camera is no longer there. But if I then turn it
back on it will not find the camera.

Hotplug is turned on in the kernel (CONFIG_HOTPLUG=y).  To get sound
to work I had to add modules to the blacklist so I think hotplug is
functional but trying the same for USB modules did not make a
difference.

Here are some of the settings in the blacklist that I tried:

# uhci ... usb-uhci handles the same pci class
usb-uhci
#usbcore ... module is loaded implicitly, ignore it otherwise
usbcore

usb_storage 
uhci-hdc
ehci-hdc
ohci-hdc




Here is the output from lsmod:

root@rpc1:~# lsmod
Module                  Size  Used by
ppp_async               9664  1 
ppp_generic            24788  5 ppp_async
slhc                    6720  1 ppp_generic
ipv6                  226720  12 
snd_pcm_oss            53096  0 
snd_mixer_oss          19712  1 snd_pcm_oss
snd_cmipci             32196  0 
snd_pcm                88648  2 snd_pcm_oss,snd_cmipci
snd_page_alloc          9416  1 snd_pcm
snd_opl3_lib           10496  1 snd_cmipci
snd_timer              24260  2 snd_pcm,snd_opl3_lib
snd_hwdep               9476  1 snd_opl3_lib
snd_mpu401_uart         7808  1 snd_cmipci
snd_rawmidi            23396  1 snd_mpu401_uart
snd_seq_device          7816  2 snd_opl3_lib,snd_rawmidi
snd                    52132  10
snd_pcm_oss,snd_mixer_oss,snd_cmipci,snd_pcm,sn
d_opl3_lib,snd_timer,snd_hwdep,snd_mpu401_uart,snd_rawmidi,snd_seq_device
soundcore               7392  1 snd
uhci_hcd               29264  0 
ehci_hcd               26116  0 
nvidia_agp              5852  1 
ohci_hcd               18756  0 
nvidia               4820500  12 
evdev                   7296  0 
3c59x                  35368  0 
usb_storage            64320  0 
agpgart                27624  1 nvidia_agp

If the system is started with the camera on, usb_storage will show up
in lsmod but it does not show up if I try to attach the camera once
the system is on. Also I have also tried manually loading usb-storage
(it seems to load without any problems) and then attaching the camera
it will not see the camera.

I tried modifying the /etv/rc.d/rc.modules file so that usb-storge
will be loaded at startup.  It will load usb-storage and show up in
lsmod but it still will not find the camera.

I have tried a several different aliases on modprob.conf.  

alias usbdevfs usbcore
#alias usb-controller usb-hdc
alias usb-controller uhci-hdc
alias usb-controller1 ehci-hdc
alias usb-controller2 ohci-hdc


Since it works fine if I attach the camera and the turn on the system
I am thinking it must be something with the hotplug configuration but
I don't know what else to try.

Any ideas what I may be overlooking?



Thanks for any help,



Art

.