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Sun, 08 Nov 2026 05:04:06 -0800 (PST) Received: from prts ([103.156.242.195]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b3755e936bsm6603194c88.6.2026.11.08.05.04.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Nov 2026 05:04:06 -0800 (PST) From: Xinyu Wei To: Jaroslav Kysela , linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, Takashi Iwai Cc: Xinyu Wei Subject: [PATCH 0/2] ALSA: usb-audio: second configuration of the Steinberg UR22C Date: Sun, 8 Nov 2026 21:03:01 +0800 Message-ID: <20261108130303.387288-1-xinyuwei1024@gmail.com> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Steinberg UR22C exposes two USB configurations: configuration 1 is class-compliant (2 playback / 4 capture channels), while configuration 2 is UAC2 behind bInterfaceClass 0xFF (6 playback / 8 capture channels and two MIDI interfaces). Selecting configuration 2 on a stock kernel leaves interfaces 0-2 unbound and registers no PCM. Patch 1 adds a composite quirk entry for configuration 2's vendor-class interfaces. Patch 2 fixes a bogus bmFormats (0xffffffff) in configuration 2's capture descriptor so opening capture as FLOAT_LE does not lock out playback via implicit feedback sync. Xinyu Wei (2): ALSA: usb-audio: name the interfaces of the Steinberg UR22C ALSA: usb-audio: fix the format bits of the Steinberg UR22C sound/usb/format.c | 5 +++++ sound/usb/quirks-table.h | 14 ++++++++++++++ 2 files changed, 19 insertions(+) -- 2.56.0