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No sound after kernel(>3.5.3-1)/nvidia(>304.43-1) upgrade.

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https://bbs.archlinux.org – Here's a clue:⋯$ aplay -l aplay: device_list:252: no soundcards found...⋯$ aplay -L null Discard all samples (playback) or generate zero samples (capture) pulse PulseAudio Sound Server default Default ALSA Output (currently PulseAudio Sound Server)Yet there are three sound devices in the system. ⋯$ lspci -vv | grep Audio 00:0f.1 Audio device: NVIDIA Corporation MCP55 High Definition Audio (rev a2) 03:00.1 Audio device: NVIDIA Corporation GF114 HDMI Audio Controller (rev a1) 04:00.1 Audio device: NVIDIA Corporation GF114 HDMI Audio Controller (rev a1) keepitsimpleen (HowTos)