Looking at the log, it almost has to be the alsa packages. See what you still have in your cache for older alsa:
ls /var/cache/pacman/pkg | grep alsa
if that shows you have the 1.1.6 versions available, pacman -U all 3 and reboot (example sudo pacman -U /var/cache/pacman/pkg/alsa-lib-1.1.6-1-x86_64.pkg.tar.xz
)