Hi again,
According to
https://wiki.archlinux.org/index.php/udev#Writing_udev_rules
and
http://www.alsa-project.org/main/index.php/Changing_card_IDs_with_udev
I've added these lines to /etc/udev/rules.d/10-local.rules .
root@dalton:/home/peter# tail --lines=6 /etc/udev/rules.d/10*
SUBSYSTEM!="sound", GOTO="my_usb_audio_end"
ACTION!="add", GOTO="my_usb_audio_end"
KERNEL=="card2", ATTRS{product}=="C-Media USB Headphone Set ", \
SYMLINK+="Headset"
LABEL="my_usb_audio_end"
Still the SYMLINK is not created.
root@dalton:/home/peter# udevadm trigger
root@dalton:/home/peter# ls /dev/H*
ls: cannot access /dev/H*: No such file or directory
root@dalton:/home/peter#
Any ideas? Thanks, ... P.
==========
root@dalton:/home/peter# udevadm info -a -p
/devices/pci0000:00/0000:00:08.0/usb6/6-3/6-3:1.0/sound/card2
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device
'/devices/pci0000:00/0000:00:08.0/usb6/6-3/6-3:1.0/sound/card2':
KERNEL=="card2"
SUBSYSTEM=="sound"
DRIVER==""
ATTR{id}=="Set"
ATTR{number}=="2"
looking at parent device '/devices/pci0000:00/0000:00:08.0/usb6/6-3/6-3:1.0':
KERNELS=="6-3:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="snd-usb-audio"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="00"
ATTRS{bInterfaceClass}=="01"
ATTRS{bInterfaceSubClass}=="01"
ATTRS{bInterfaceProtocol}=="00"
ATTRS{supports_autosuspend}=="1"
looking at parent device '/devices/pci0000:00/0000:00:08.0/usb6/6-3':
KERNELS=="6-3"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 4"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="a0"
ATTRS{bMaxPower}=="100mA"
ATTRS{urbnum}=="71"
ATTRS{idVendor}=="0d8c"
ATTRS{idProduct}=="000c"
ATTRS{bcdDevice}=="0100"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="6"
ATTRS{devnum}=="4"
ATTRS{devpath}=="3"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="0"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{product}=="C-Media USB Headphone Set "
looking at parent device '/devices/pci0000:00/0000:00:08.0/usb6':
KERNELS=="usb6"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="90"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0001"
ATTRS{bcdDevice}=="0302"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="6"
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="3"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 3.2.0-4-686-pae ohci_hcd"
ATTRS{product}=="OHCI Host Controller"
ATTRS{serial}=="0000:00:08.0"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/pci0000:00/0000:00:08.0':
KERNELS=="0000:00:08.0"
SUBSYSTEMS=="pci"
DRIVERS=="ohci_hcd"
ATTRS{vendor}=="0x1033"
ATTRS{device}=="0x0035"
ATTRS{subsystem_vendor}=="0x9005"
ATTRS{subsystem_device}=="0x0012"
ATTRS{class}=="0x0c0310"
ATTRS{irq}=="17"
ATTRS{local_cpus}=="ffffffff"
ATTRS{local_cpulist}=="0-31"
ATTRS{dma_mask_bits}=="32"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{enable}=="1"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
root@dalton:/home/peter#
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