[alsa-devel] WM8750 utilization

Mark Brown broonie at sirena.org.uk
Fri Aug 15 18:58:15 CEST 2008

On Fri, Aug 15, 2008 at 06:32:37PM +0200, Harald Radke wrote:

> The Loox720 has a headphone jack, a earpiece and a speaker.

Please post your machine driver.  If you are doing code modifications to
make any of the changes you discuss below please also show these

> When driving LOUT1/ROUT1, sound goes via headphones, LOUT2/ROUT2 drives the 
> earpiece. When setting OUT3 on ROUT1, the speaker plays fine.

Could you please also clarify how the hardware is connected up here?
Which outputs on the device are connected to each of the headphone,
speaker and earpiece?

> - Trying to utilize headphone switch via the WM8750 registers doesn't really 
> work ): depending on the polarity bit either one of the OUTs is either not 
> muted at all or activated at all.

Are you sure that HPDETECT is wired up correctly and that the expected
level change occurs on it when the jack is inserted and removed?

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