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ALSA: docs: Add description of usb-audio playback_urb_fixup quirk

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We missed the description for the recently introduced quirk bit
QUIRK_FLAG_PLAYBACK_URB_FIXUP.  A brief explanation is added here.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260729074523.92761-2-tiwai@suse.de
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Takashi Iwai 2026-07-29 09:45:16 +02:00
parent b7adaa94e3
commit a08ec82525
1 changed files with 5 additions and 0 deletions
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5
Documentation/sound/alsa-configuration.rst
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@ -2401,6 +2401,11 @@ quirk_flags
disabling GET_CUR instead of the whole mixer. The current volume will
then be provided by the internal cache that stores the last set
volume
* bit 31: ``playback_urb_fixup``
Some devices show the stuttering at playback, and this quirk
works around it by enforcing the fixed max URBs (12) instead of
the dynamic calculation from the buffer size, and passing the
`URB_ISO_ASAP` URB flag.
This module supports multiple devices, autoprobe and hotplugging.