[pulseaudio-discuss] [PATCH] Add HDMI Surround 7.1 profiles

Alexander E. Patrakov patrakov at gmail.com
Wed Jul 16 07:40:23 PDT 2014

16.07.2014 19:47, David Henningsson wrote:
> So, given this the only place where extra 7.1 profiles actually take
> some time to consider is this one (NVIDIA HDMI). Where adding 7.1
> profiles to all four devices would probably lead to an additional
> startup delay of 100 - 150 ms.
> All other places we probably get stopped in userspace, which means less
> than a ms delay.

I have updated the patch, and found that around 100 ms get wasted 
reliably for something that is neither mapping_open_pcm() nor 
mapping_paths_probe() before probing surround21 on the USB headphones. I 
do not understand this phenomenon (might be a buggy patch due to the 
noise here).

The new timing patch is attached, as well as the gzipped 
very-very-verbose log from that PC.

Alexander E. Patrakov
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