[issue676] SB600 HDA audio (Realtek ALC883) glitch - IRQ sharing?

["Joe \"Floid\" Kanowitz" <sinknull@xxxxxxxxxxxxxxxxxxxxxxx>]

Joe "Floid" Kanowitz <jkanowitz@snet.net> added the comment:

*On* topic:

Pulled out the USB devices, pulled ehci from loader.conf, booted perfectly. 
pcm0 came up on IRQ 15, where the BIOS had it.

No luck, it got worse.  Again, I should probably make audio samples, but it
changes from the 'annoying crackle' to a pretty consistent throb/echo, not so
much fast "cat /dev/urandom > /dev/dsp" static as something both getting
retriggered/looping and introducing noise.

An 'e' in morse -p might get something like
"bibibip(chush)(chush)(chush)(chush);" the string 'test' would probably take at
least a minute to conclude, and it took at least a good ten seconds to get it to
stop after ^C.

Tried a 48KHz .wav for curiosity, as bad.  Tried enabling the emergency
interrupt polling sysctl while interactive with no impact.

Without a mouse, keyboard input did seem to affect it a bit, but not to the
point of clearing it up as observed with the APIC_IO kernel and the mouse-shakes.


Verbose dmesg:
http://bugs.dragonflybsd.org/file276/dmesg.NOAPIC.10-Jun-07 

The HDA debugging messages on the tail are from my first invocation of mplayer
on a MP3, I think.  It does spit something out every time the device is accessed.

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