On 2014-07-16 16:40, Alexander E. Patrakov wrote: > 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). profile_finalize_probing calls snd_pcm_close, which communicates with the hardware. Unless that is accounted for, I assume that could be the delays you're seeing. > > The new timing patch is attached, as well as the gzipped > very-very-verbose log from that PC. > -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic
