[alsa-devel] Avoid overload of PCM volume on Cx5045 codec

Andreas Påhlsson andreas at pahlsson.info
Thu Jun 19 13:34:25 CEST 2008


    description: Notebook
    product: AMILO Pro V3205
    version: Rev 1
    serial: YK2H004201
    width: 32 bits
    capabilities: smbios-2.4 dmi-2.4 smp-1.4 smp
    configuration: boot=oem-specific chassis=notebook cpus=2



I have of course played with all the settings with alsamixer before
compiling a kernelmodule. As per the comment to the patch the sound
can become very distorted without it. 6 dB works fine for me.

For me it is a little strange that it is the PCM volume and not the
Master volume that can be boosted. PCM sounds like it would be a
internal digital amplification control, Master sounds more like an
analog output amplifier control. But thats just me and I don't know
the chip at all.



2008/6/19 Takashi Iwai <tiwai at suse.de>:
> At Wed, 18 Jun 2008 21:58:40 +0200,
> =?ISO-8859-1?Q?Andreas_P=E5hlsson?= wrote:
>> Hello.
>> I've had a problem with low volume on my laptop and while scratching
>> this itch I found the patch titled "hda-codec - Avoid overload of PCM
>> volume on Cx5045 codec" I reverted this patch and of course got a lot
>> more volume. The description states: "The PCM volume of Cx5045 codec
>> has overload that isn't useful but rather harmful.  Add a hack to
>> override the amp info to set the max level 0 dB.". Does anybody know
>> where to find more information on a better default value for the max
>> level setting?
> Then maybe this workaround is specific to HP laptops.
> Could you give the alsa-info.sh output, and a more detailed
> information of your laptop (vendor, model)?  Before working on the
> source code, one should check the mixer setting at first.
> Takashi
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