[oe-issues] [Bug 2667] Sound problems with recent kernels a.k.a. asound statefiles need updating

[bugzilla-daemon at tinman.treke.net]

http://bugs.openembedded.org/show_bug.cgi?id=2667





--- Comment #9 from Stanislav Brabec <utx at penguin.cz>  2007-08-01 15:09:28 ---
See http://www.wolfsonmicro.com/uploads/documents/WM8750.pdf for more about
Spitz sound chip (especially block diagram is useful).


I have no confirmation yet, but it seems that Zaurus use 5 pin jack connector:

Left jack ring: LOUTPUT1+LINPUT1

Right jack ring: ROUTPUT1

Third jack ring: One pin for remote (basically resistance meter).

Fourth jack ring: There are two pins. One of them is second pin for remote,
second is headphones detection (might be RINPUT3 switched to phones detection
mode).

Hardware things I still do not know:

- I do not know, which one is ground. It is most probably one of remote pins.

- Which wire should be used for microphone bias.

- Why designers did not connect RINPUT1 to right ring.


And the speaker is connected between R and L WM8750 speaker outputs (yes, it
outputs difference between L and R in the default setting).


All other wires are probably not connected.


See also bug 2617 initial comment for my experiment results, bug 2571 comment 4
for my patch for zaurusd fixing misconfiguration after phones
insert/removal/close lid and bug 2618 for my my guess on Spitz wiring.


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