ID_ID in udev will no longer append the ALSA "id" sysattr. This means ID_ID will change to a new string after this update, but no longer be system unique for USB. (It is theoretically not system unique for firewire already, since broken devices can ship with a duplicate guid and no checking is done.) The ALSA id sysattr is derived from some internal properties of the device by the kernel. It is actually a read/write attribute, but ALSA enforces uniqueness systemwide. This means that currently, ID_ID is enumeration dependent in the case of multiple identical hardware. Please see this discussion: http://lists.freedesktop.org/archives/systemd-devel/2015-April/030925.html This is essentially a revert of systemd ed1b2d9fc7d5c5bfe2a67b0b8ff9e5ea8694268e.
I figure this isn't high pressure to change in PA, given that this is a corner case. And I don't really know what the right approach actually is to fix this, but I think the original change should never have been added to udev's rules files, hence let's remove that from them.
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