[alsa-devel] No headphone output on HT Omega Claro Halo

Christopher J. Atherton the8lack8ox at gmail.com
Sat Mar 7 02:43:57 CET 2009

Christopher J. Atherton wrote:
> Clemens Ladisch wrote:
>> Christopher J. Atherton wrote:
>>> I have an HT Omega Claro Halo (CMI8878) card that is not entirely
>>> working.  This card has two analog outputs, a pair of RCA connectors and
>>> also a separate headphone output (3.5mm jack).  The RCA outputs work,
>>> but the headphone output, which notably passes a signal from a built in
>>> headphone amp, does not.
>> Please try this patch:
>> --- linux/sound/pci/oxygen/oxygen.c
>> +++ linux/sound/pci/oxygen/oxygen.c
>> @@ -200,6 +200,8 @@ static void halo_init(struct oxygen *chip)
>>  {
>>  	ak4396_init(chip);
>>  	ak5385_init(chip);
>> +	oxygen_set_bits16(chip, OXYGEN_GPIO_CONTROL, 0x100);
>> +	oxygen_set_bits16(chip, OXYGEN_GPIO_DATA, 0x100);
>>  }
>>  static void generic_cleanup(struct oxygen *chip)
> That did the trick.  Many thanks!  However, I've now noticed that the
> PCM volume control doesn't work at all, which is somewhat inconvenient
> since the card is very loud and Master only makes my 64 ohm headphones
> comfortable at "5" (-25 dB).
> -- Kristoff

OK, nevermind.  I've been fiddling around a bit, and finally got the PCM
control working.  Not sure about what happened, but after reconfiguring
and reinstalling the drivers several times, the PCM control works
normally.  Thanks again.

-- Kristoff

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