On Mon, Nov 11, 2019 at 7:22 AM Jaroslav Kysela perex@perex.cz wrote:
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 cujomalainey@chromium.org
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 willincrease latency.
- DisableSoftwareVolume
*/ int snd_use_case_get(snd_use_case_mgr_t *uc_mgr, const char *identifier,
- Set to "1" to force userspace to use hardware volume controlsMy 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
+Jimmy Cheng-Yi Chiang can you clarify in what context CRAS might need this value? The only cases I see are for Chat 150 C and Jabra SPEAK 810. There are no volume mixers associated with these files.
-- Jaroslav Kysela perex@perex.cz Linux Sound Maintainer; ALSA Project; Red Hat, Inc.