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

[Takashi Iwai]

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