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Mon, 11 Nov 2019 16:22:40 +0100 (CET) To: Curtis Malainey , alsa-devel@alsa-project.org References: <20191107015808.26844-1-cujomalainey@chromium.org> <20191107015808.26844-6-cujomalainey@chromium.org> From: Jaroslav Kysela Message-ID: Date: Mon, 11 Nov 2019 16:22:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191107015808.26844-6-cujomalainey@chromium.org> Content-Language: en-US Cc: broonie@kernel.org Subject: Re: [alsa-devel] [PATCH 06/11] ucm: docs: Add DisableSoftwareVolume X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Dne 07. 11. 19 v 2:58 Curtis Malainey napsal(a): > Some userspace audio servers might default to software volume, this > allows the ucm to force its behaviour > > Signed-off-by: Curtis Malainey > --- > include/use-case.h | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/include/use-case.h b/include/use-case.h > index 05628303..1aeaf9d4 100644 > --- a/include/use-case.h > +++ b/include/use-case.h > @@ -334,6 +334,8 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr, > * - This is used on platform where reported buffer level is not accurate. > * E.g. "512", which holds 512 samples in device buffer. Note: this will > * increase latency. > + * - DisableSoftwareVolume > + * - Set to "1" to force userspace to use hardware volume controls > */ > int snd_use_case_get(snd_use_case_mgr_t *uc_mgr, > const char *identifier, > My understanding is that if the hardware volume controls are defined in UCM, then the UCM user (audio server) should use them. Otherwise, the software volume control should be applied. I don't see the reason to have this info doubled. Jaroslav -- Jaroslav Kysela Linux Sound Maintainer; ALSA Project; Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel