On 09/22/2012 08:54 PM, Arnout Engelen wrote:
Hi,
I've got a laptop with a HD Audio onboard sound card: the CX20590.
It seems like this card has a sort of 'hardware mute state': the 'mute button' has a light, and when this light is on, no sound is heard, regardless of whether or not the channel is muted in the ALSA mixer.
The hardware mute button switches the 'hardware mute state', and also sends a keyboard event which I can use to also update the ALSA mixer mute.
This doesn't, however, work the other way around: I haven't found any way yet to manipulate the 'hardware mute state' from software.
Looking with hda_analyzer, I notice this card has a 'Vendor Defined Widget'. Might this be something that could be used to manipulate the hardware mute state? I can use hda-verb but I wouldn't know how to discover which verb to use. Anything else to try?
Attached is the codec info.
We generally recommend people to submit the entire alsa-info, rather than just the codec info (which, btw, was an empty attachment). In particular; if you're having a thinkpad, the mute LED is controlled through thinkpad-acpi, and if you're having an HP, it's usually connected to the codec in a way hinted by BIOS. Given that you have a conexant codec, I'm guessing it's a thinkpad.