Re: sd card not detected

[Alex Mestiashvili <alex@biotec.tu-dresden.de>]

On 11/02/2013 04:18 AM, Patrick Bartek wrote:
> On Fri, 01 Nov 2013, Alex Mestiashvili wrote:
>
> > Hi All,
> >
> > A card inserted into card reader is not mounted automatically and
> > even doesn't shown up in the dmesg output, but if I switch off and on
> > the monitor with cardreader or run lshw the card appears and is
> > mounted.
> >
> > the same happens with the second card reader in the pc. ( one is in
> > monitor, second in the computer itself)
> >
> > other usb devices work fine.
> >
> > The hci/usb modules:
> >
> > lsmod | egrep "hci|usb_storage"
> > usb_storage            39406  0
> > ehci_pci               12432  0
> > ohci_hcd               22150  0
> > ehci_hcd               35820  1 ehci_pci
> > scsi_mod              131001  5 sg,usb_storage,libata,sd_mod,sr_mod
> > usbcore               110348  8
> > snd_usb_audio,uvcvideo,usb_storage,ohci_hcd,snd_usbmidi_lib,ehci_hcd,ehci_pci,usbhid
> >
> > The system is jessie, kernel: 3.10-3-686-pae
> >
> > Something must be missing, but I really wonder what, as far as I
> > understand hardware detection is kind of kernel feature..
> Usually your desktop environment, whichever one you use, has the
> utility, scripts, etc. that mount (and unmount) such devices
> automatically.  You didn't say which one you are using.  So, if you do
> have a desktop, something failed to be install that does this
> mounting.  What that may be I couldn't say without more info on your
> system.
>
> I don't run a desktop at all on my 64-bit Wheezy system.  Just a window
> manager (Openbox), LXPanel and Debian Menu.  I had to write my own udev
> rules to mount USB thumb drives, SD cards, etc.  You might look into
> that. Works just fine as soon as you have those scripts.
>
> B

I use xfce4 4.10, but in this case I think it has nothing to do with the 
problem.
The problem is that the device is not detected by the kernel .

it is not visible in the dmesg output and not visible in the output of 
fdisk -l.
But other usb devices work fine - a usb stick is detected and mounted 
automatically.

ls -l /dev/sd*
<skip>
brw-rw---- 1 root floppy 8, 112 Nov  2 11:32 /dev/sdh

/dev/sdh -is the cardreader device.

after inserting a sd card nothing happens - /dev/sdh1 doesn't appear, 
but it appears if I run fdisk -l /dev/sdh for example.

So I think it is somehow related to the cardreader, but because I have 
two of them in the same box and both don't work,  there should be 
something else.

How it is implemented in the current Linux systems ? is there a daemon 
which checks devices from time to time or is it interrupt driven or ... ?

it shouldn't be much different from the other usb devices I think.

Thanks,
Alex