Sorry, but nothing of that worked for me.
1. I used "blacklist snd_pcsp" instead of "blacklist pcspkr" in /etc/modprobe.d/blacklist.conf
2. Also made a file with the text:
install pcspkr /bin/true
as root and saved it as /etc/modprobe.d/00local
3. blacklist snd_pcsp in /etc/modprobe.d/fbdev-blacklist.conf
4. "lsmod | grep spkr" gave no output