As Sebastian Ssmoller pointed out in [1], the pcm(4) driver doesn't work on an ASUS M2400N notebook with a RELENG_5_2 system. I'm having the same problem now, on the same model: | pcm0: <Intel ICH4 (82801DB)> port 0xe100-0xe13f,0xe000-0xe0ff at device 31.5 on pci0 | pcm0: unable to map IO port space | device_probe_and_attach: pcm0 attach returned 6 What wasn't said in that thread was that this did work in 5.1 (with ACPI enabled), as you can see from the dmesg output available at [2]. The complete dmesg output of the current system is attached to this mail. (I don't know if it's of any relevance, but it might be worth mentioning that IRQ 5 occurs frequently in it.) Maybe this helps to find the cause of the problem. Stefan [1]: http://groups.google.de/groups?selm=1071330727.904.19.camel%40tyrael.linnet.lucky.freebsd.current [2]: http://www.gegenunendlich.de/stuff/garuda/garuda.dmesg
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