As requested—
http://home.comcast.net/~jpiszcz/20140530/lsusb-vvvv.txt
http://home.comcast.net/~jpiszcz/20140530/full-pulse-audio-log.txt
Your log is useless
You have to change log-info=debug in daemon.conf and restart pulseaudio
https://bugzilla.redhat.com/show_bug.cgi?id=1065097
USB Mixer: usb_id=0x0d8c0008, ctrlif=0, ctlerr=0 Card: C-Media USB Audio Device at usb-0000:00:1d.0-1.1.1, full speed Unit: 9 Control: name="Speaker Playback Volume", index=0 Info: id=9, control=2, cmask=0x3, channels=2, type="S16" Volume: min=-7264, max=-16, dBmin=-2837, dBmax=-6
your USB audio device are unlikely to provide 28.31/7248 dB per step
http://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Decibel/
If hardware volume control always less than 0dB Pulseaudio need to use software volume (GAIN) for PA_VOLUME_NORM when volume slider is at maximum, software volume need rewind of audio data in sound card buffer for recalulation when you change volume slider
Ø step to reproduce your problem when you report the bug
I often SSH to my machine or use X remotely and not locally— this is the
first time I have seen this in logs that I can remember and I’ve not changed anything locally.
https://bugs.freedesktop.org/show_bug.cgi?id=46236
The workaround seem to use ignore_dB=1