On Wed, Oct 15, 2008 at 09:03:00AM +0200, Aniruddha wrote:
> On Tue, 2008-10-14 at 23:43 -0700, Jeremy Chadwick wrote:
> > > Thanks, I followed the faq to the letter and it show a dialog when I
> > > insert a USB stick. Unfortunately when I insert an sdcard still nothing
> > > happens.
> > 
> > Can anyone confirm that dbus and/or hald have anything to do with this?
> > (I thought those were specific to X...)
> > 
> > When attaching a USB device to a USB port, the kernel will notice the
> > device has been added and will do the proper enumeration.  For example,
> > when adding a USB hard disk or a USB pen drive, a umass device will be
> > found, then a daX device should be created (which is what you use to
> > access the disk; USB storage devices appear as SCSI disks).
> > 
> > But in the case of a USB device that's already attached to the bus, e.g.
> > one of those 7-in-1 card readers, I cannot see how adding a SD/MMC card
> > would cause the hard disk to suddenly show up.
> > 
> > You would need to run "camcontrol rescan 0", to cause the device to be
> > re-scanned for any media which was inserted.
> Thanks for the quick and extensive answer. I'll check the exact behavior of  
> the 7-in-1 card reader somewhat more.

The card reader is already attached to the USB bus once the kernel
loads.  To find actual inserted/removed media, you will need to
do the camcontrol command I listed off.

Also: ALWAYS be sure to use "umount" to unmount the filesystems *BEFORE*
removing the media.  Not doing so will result in a kernel panic.
Consider yourself warned.

Supposedly this has been fixed in CURRENT/HEAD.

| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |

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