Arch Linux

% start-pulseaudio-x11
E: [pulseaudio] main.c: Daemon startup failed.

I: [alsa-source] core-util.c: Failed to acquire real-time scheduling: Permission denied
I: [pulseaudio] module.c: Loaded "module-alsa-card" (index: #5; argument: "device_id="1" name="pci-0000_00_14.2" card_name="alsa_card.pci-0000_00_14.2" namereg_fail=false tsched=yes ignore_dB=no deferred_volume=yes card_properties="module-udev-detect.discovered=1"").
I: [pulseaudio] module-udev-detect.c: Card /devices/pci0000:00/0000:00:14.2/sound/card1 (alsa_card.pci-0000_00_14.2) module loaded.
I: [pulseaudio] module-udev-detect.c: Found 2 cards.
I: [pulseaudio] module.c: Loaded "module-udev-detect" (index: #6; argument: "").
D: [pulseaudio] cli-command.c: Checking for existence of '/usr/lib/pulse-1.0/modules/module-jackdbus-detect.so': success
Inconsistency detected by ld.so: dl-open.c: 597: _dl_open: Assertion `_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT' failed!

Installing 'jack' will fix this issue. Also commenting out the jack section in /etc/pulse/default.pa also works around the problem. See forum topic: https://bbs.archlinux.org/viewtopic.php?id=127480