From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hui Wang Subject: Re: Shared volume control again Date: Thu, 30 Oct 2014 10:24:18 +0800 Message-ID: <5451A152.5030206@canonical.com> References: <54511FEE.40906@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by alsa0.perex.cz (Postfix) with ESMTP id 1AD012604F3 for ; Thu, 30 Oct 2014 03:24:25 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Raymond Yau , David Henningsson Cc: Takashi Iwai , ALSA Development Mailing List List-Id: alsa-devel@alsa-project.org On 10/30/2014 09:18 AM, Raymond Yau wrote: >>> thinking of the problem about shared volume controls again, I stumbled >>> on a case where your suggested solution doesn't work well. Namely, >>> when a headphone volume is shared for two headphones (one on the >>> laptop and one on the dock), how should it be named? One is >>> "Headphone" and another is "Dock Headphone". That's a bit tricky. >>> >>> So, in the end, we need the mapping representation somehow more >>> explicitly than the control name. >>> >>> Thoughts? >> >> In practice, it seems like we more often than not share DAC for all > headphones. Also it is very common today that a jack called "Front > Headphone" has a volume control called only "Headphone". >> That's the status quo. As a result we have only one headphone path in > PulseAudio for all types of headphones. >> And it kind of works as long as we *always* share DAC between the > different headphones. > > it is unlikely that dual headphone jacks share DAC on those Dell XPS > notebook with 8 channels hda codec > > Surround 40 should not be supported when headphone and dock headphone > always share DAC > > Are there any difference when dock station has dock line out instead of > dock headphone? > > Another ad hoc case is asus g75 with vt1802 which have speaker and > subwoober, headohone and speaker share DAC so that the subwoofer can have > volume control Hi Raymond, It seems like you are familiar with hardware configuration for different machines, BTW do you know any Lenovo/Dell/HP laptops which have subwoofer on them? Thanks, Hui. > For Dell alienware notebook with alc668, headset and headphone jack, mic > jack internal 2.1 speaker > > User expect the headset jack default to be used as headset since the > notebook has another headphone jack > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >