[FS#256] usb audio doesn't work - "no such device"

[LEDE Bugs]

The following task has a new comment added:

FS#256 - usb audio doesn't work - "no such device"
User who did this - Mathias Kresin (mkresin)

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I rather guess the error is due to [[
https://git.lede-project.org/?p=source.git;a=blob;f=target/linux/generic/config-4.4;hb=76847c7fc90e53d540aa7946fbbb774c670346f3#l3780|# CONFIG_SND_PCM_TIMER is not set]]

The [[http://cateee.net/lkddb/web-lkddb/SND_PCM_TIMER.html|kernel config help text]] has some important information regarding to our (kernel) use case:

> For some embedded devices, we may disable it to reduce memory footprint, about 20KB on x86_64 platform.

It's not clear to me if these extra 20KB are only used if the snd kernel module is loaded or even if the module is not loaded. This should be check by someone who is interested in this feature before enabling this kernel config option.

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=256#comment729