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ALSA: doc: usb-audio: Add doc for QUIRK_FLAG_IFB_SILENCE_ON_EMPTY

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JIRA: https://issues.redhat.com/browse/RHEL-193253

commit 06363f96e3d6b54ff7b5d2ce85cab95bd5e874b0
Author: Rong Zhang <i@rong.moe>
Date: Wed May 27 01:49:23 2026 +0800

    ALSA: doc: usb-audio: Add doc for QUIRK_FLAG_IFB_SILENCE_ON_EMPTY

    QUIRK_FLAG_IFB_SILENCE_ON_EMPTY was introduced into usb-audio before
    without appropriate documentation, so add it.

    Fixes: a23812004228 ("ALSA: usb-audio: add IFB_SILENCE_ON_EMPTY quirk for Behringer Flow 8")
    Signed-off-by: Rong Zhang <i@rong.moe>
    Link: https://patch.msgid.link/20260527-uac-quirk-get-cur-vol-v1-1-e9362b712e5e@rong.moe
    Signed-off-by: Takashi Iwai <tiwai@suse.de>

Signed-off-by: Jaroslav Kysela <jkysela@redhat.com>
This commit is contained in:
Jaroslav Kysela
2026-07-29 10:44:35 +02:00
parent dda5973b8d
commit bd23b53a89
1 changed files with 6 additions and 0 deletions
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Documentation/sound/alsa-configuration.rst
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@@ -2383,6 +2383,12 @@ quirk_flags
``V(x) = k * x``; ``dB(x) = 20 * log10(x)``. Overrides bit 24 ``V(x) = k * x``; ``dB(x) = 20 * log10(x)``. Overrides bit 24
* bit 28: ``mixer_capture_linear_vol`` * bit 28: ``mixer_capture_linear_vol``
Similar to bit 27 but for capture streams. Overrides bit 25 Similar to bit 27 but for capture streams. Overrides bit 25
* bit 29: ``ifb_silence_on_empty``
In implicit feedback mode, when an entire capture URB returns with
all iso_frame_desc[i].status != 0 (bytes==0), do not silently return
from snd_usb_handle_sync_urb. Instead fall through and enqueue a
packet_info containing only size-0 packets, so the OUT ring keeps
moving (emits silence). Needed by Behringer Flow 8 (1397:050c).
This module supports multiple devices, autoprobe and hotplugging. This module supports multiple devices, autoprobe and hotplugging.