On Tue, 21.04.15 17:45, Adam Goode (ago...@google.com) wrote: > The ALSA id sysattr is generated by the sound subsystem and is not > a stable identifier. It is generated though some string manipulation > then made unique if there is a conflict. This means that it is > enumeration-dependent and shouldn't be used for ID_ID. > > If ID_ID is supposed to be system-unique, it is not already since > for firewire it is generated from the guid and there are broken > firewire devices that have duplicate guids across devices. > > This is tracked for PulseAudio at > https://bugs.freedesktop.org/show_bug.cgi?id=90129.
Please also mention that commit that this effectvily reverts, see earlier discussion. > --- > rules/78-sound-card.rules | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/rules/78-sound-card.rules b/rules/78-sound-card.rules > index 295f490..bd7a994 100644 > --- a/rules/78-sound-card.rules > +++ b/rules/78-sound-card.rules > @@ -49,8 +49,8 @@ SUBSYSTEMS=="firewire", GOTO="skip_pci" > SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", > ENV{ID_MODEL_ID}="$attr{device}" > LABEL="skip_pci" > > -ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", > ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}-$attr{id}" > -ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", > ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$attr{id}" > +ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", > ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}" > +ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", > ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}" > > IMPORT{builtin}="path_id" > > -- > 2.2.0.rc0.207.ga3a616c > > Lennart -- Lennart Poettering, Red Hat _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel