[alsa-devel] Scarlett 18i8 hardware out of sync with AlsaMixer

[Adam Goode]

The settings were not reset across a mem sleep (echo mem > /sys/power/state).

Hard power off / power on does make the settings get out of sync.




Adam


On Wed, May 27, 2015 at 2:43 AM, Takashi Iwai <tiwai at suse.de> wrote:
> At Tue, 26 May 2015 21:39:22 -0400,
> Adam Goode wrote:
>>
>> Linux 4.0.2-300.fc22.x86_64
>>
>> Hi,
>>
>> I have the Scarlett 18i8 USB device that is supported by the new
>> scarlett_mixer.c code. I am happy to say that the mixer code works in
>> most cases. But under some conditions, I cannot get any sound out of
>> the device until I go and toggle the "Matrix 01 Input" and "Matrix 02
>> Input" enums up and then down (from PCM 1 and PCM 2). This appears to
>> me to be some kind of cache invalidation bug, where the device is out
>> of sync with kernel mixer state.
>>
>> I will take a look at the code myself at some point, but not for a
>> while. But I am happy to try patches if anyone comes up with anything
>> in the mean time.
>
> Does it happen after some S3/S4 or even during a normal operation
> without power-saving?  The USB-audio device supports autopm, so this
> needs to be checked, too.
>
>
> Takashi