I'm seeing odd udev stuff in F20

[Bruno Wolff III]

I've been having sound issues for over a week. The sound devices are not 
visible to pulseaudio. At first they would be for a while and disappear, 
not I can't seem to get pulseaudio to see them ever. (I have have a 
motherboard sound chip and a USB headset.) I am also having an issue 
with the loopback module not being loaded by default. This breaks 
mounting iso images and the error message doesn't make one want to 
run modprobe loop (until after using google).

I don't know if this is a kernel issue, udev, pulseaudio or something 
else. I don't use the sound often enough to know immediately when it 
breaks, so I don't have a good idea which updates break things.

Something that may or may not be related is that kdm doesn't start up 
properly. I have to manually restart it after booting to get a gpaphical 
display. kdm has been acting up for a similar time span, so maybe there 
is some correlation. Once kdm is working it stays work until the next 
boot, so again I am not sure which update broke things. It may be a kde 
issue (since there have been kde updates), or it may be that something 
kdm expects isn't there early in the boot process.