Blame SOURCES/modprobe-dist-oss.conf

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# OSS Sound Support
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# This has been disabled in F11 onwards because it can interfere with the
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# PulseAudio sound service (a legacy OSS application can prevent PulseAudio
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# applications from playing sound by preventing PulseAudio from (re-)opening
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# the sound device). To re-enable support, copy this file to
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# the /etc/modprobe.d directory.
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#
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install snd-pcm /sbin/modprobe --ignore-install snd-pcm && /sbin/modprobe snd-pcm-oss && /sbin/modprobe snd-seq-device && /sbin/modprobe snd-seq-oss