hi, all,

     after I use UI interface with pavucontrol to tune output devices 
volume rapidly many times, the volume adjust seems doesn't work!
     error occur in dmesg:

[  568.807025] ALSA sound/pci/hda/hda_intel.c:716: azx_get_response 
timeout, switching to polling mode: last cmd=0x001f000a
[  569.808026] ALSA sound/pci/hda/hda_intel.c:755: hda_intel: 
azx_get_response timeout, switching to single_cmd mode: last cmd=0x001f000a

realtek ALC888 codec.
alsa version 1.0.23

attached the alsa-info output.

any comment?

BR,
Keyon