From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=195.135.223.131 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794043424; b=k1ltMoZexUhKdOZJZzof0gcpj0D4iGbFwJzudaN/ds2xfgcVOf7wTgELv89VKXdmr86p t89vuX7+za4T9j1NyDsTVxf4F17zRYc6+Hz8+8O9fbGDJ41+FlfFKtudeApyBZars0x43 HF0I1EeNIMIRgPQ2t203eHQy8n5whK2esfV+SHVGaCu4yO+UWPzJX9quQfXzIU6RVrjmM AmMpqU7gx5EejpyBnIblxoPekYBWo65WiPKeNS0NGeeemGqpvT0jf0I5EKRaZFN96FdGy J25/GvrGZLJFoMG7iT5phuuqj4fhIwTN2pXF+sqfIjP5vNz3ONpyGUcHI7FPP9DQRIA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794043424; h=DMARC-Filter:Received:DKIM-Signature:DKIM-Signature:DKIM-Signature: DKIM-Signature:Received:Received:Date:Message-ID:From:To:Cc:Subject: In-Reply-To:References:User-Agent:MIME-Version:Content-Type: X-Spamd-Result:X-Spam-Score:X-Spam-Level:X-Spam-Flag; bh=Ht1I7RV4Sehfh9ggKapwU4UF2tcxF6K737njmO0bQyc=; b=tPMKDaipWtPN0e7H8SzqtbAN6JmbWLviMGDImmWH1BfXLHvjkQH6HnHIogxaEIJV+RxM RluiKMB4edoswlJFYPG7ODaXXWhr4FBd7VyxK2HGDExhy/e8hyGJtvLLlah3dGtiRm1tE /Y+7mwU1Ika8PKayHXRQ2gMkfLe2pByL4/A+z8kE6d9gL9dRI2FhJF6NVFTb4xzdpRaM4 +Jun9TNXlFvilaLA8oo7Sv2Xh936Grhw58j2KJG5DoV+i+qKU0hdFKusgF9Ed2FkygdJo DrKx9myrg4QEkiwc7OWM/xn3ZeK5gll3ZQ/EzUQ7pQeGAbfpqg8+7O02MS/PbT2ZBxA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=2B0ffEDs; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=pWwI7GaB; dkim=pass header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=2B0ffEDs; dkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=pWwI7GaB; arc=none smtp.remote-ip=195.135.223.131 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 87C87606A326; Sat, 7 Nov 2026 09:23:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 87C87606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=2B0ffEDs; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=pWwI7GaB; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=2B0ffEDs; dkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=pWwI7GaB Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 8BCDC1F74D; Sat, 7 Nov 2026 09:23:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1794043421; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ht1I7RV4Sehfh9ggKapwU4UF2tcxF6K737njmO0bQyc=; b=2B0ffEDsuh7PD9BFC2cmHOk8+JP+/D+RZSi9tXZOsD08QGxFfaWGkiXuaO8hzHgue32AJ8 PPU3OntWX3Ad258cOX+LEiB/QTBPl00p//tcAsvD6FnU7CoHLMUDgPw3folDYDnnyvbej+ KrZq0OmXzb7xnH/AuUsH1ja0nDzbSkM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1794043421; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ht1I7RV4Sehfh9ggKapwU4UF2tcxF6K737njmO0bQyc=; b=pWwI7GaBumYIYdzkT1Sn8n7kQiwc/3YR0SlMVphRtPL3k8R4wVKwqvxLi5JHQ9r68Enp7e pBbFvWdHTmuFyKBQ== Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1794043421; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ht1I7RV4Sehfh9ggKapwU4UF2tcxF6K737njmO0bQyc=; b=2B0ffEDsuh7PD9BFC2cmHOk8+JP+/D+RZSi9tXZOsD08QGxFfaWGkiXuaO8hzHgue32AJ8 PPU3OntWX3Ad258cOX+LEiB/QTBPl00p//tcAsvD6FnU7CoHLMUDgPw3folDYDnnyvbej+ KrZq0OmXzb7xnH/AuUsH1ja0nDzbSkM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1794043421; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ht1I7RV4Sehfh9ggKapwU4UF2tcxF6K737njmO0bQyc=; b=pWwI7GaBumYIYdzkT1Sn8n7kQiwc/3YR0SlMVphRtPL3k8R4wVKwqvxLi5JHQ9r68Enp7e pBbFvWdHTmuFyKBQ== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 25747132C9; Sat, 7 Nov 2026 09:23:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id guNTOhzu7mqhbgAAD6G6ig (envelope-from ); Sat, 07 Nov 2026 09:23:41 +0000 Date: Sat, 07 Nov 2026 10:23:40 +0100 Message-ID: <877bipyoyr.wl-tiwai@suse.de> From: Takashi Iwai To: Cristiano Souza Cc: linux-sound@vger.kernel.org, tiwai@suse.com, stable@vger.kernel.org Subject: Re: [PATCH v3] ALSA: usb-audio: Skip broken playback feature unit on XiiSound chips In-Reply-To: <20261107022643.135168-1-cristianocps@gmail.com> References: <20261107022643.135168-1-cristianocps@gmail.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spamd-Result: default: False [-12.30 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_TO(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_THREE(0.00)[4] X-Spam-Score: -12.30 X-Spam-Level: X-Spam-Flag: NO On Sat, 07 Nov 2026 03:26:43 +0100, Cristiano Souza wrote: > > Weltrend XiiSound-based devices (040b:0897, e.g. Redragon H878 > wireless headset) expose a UAC1 playback feature unit whose volume > and mute controls are unusable in practice: the reported per-channel > dB range is only 0..+0.39dB, yet setting any volume below the > maximum mutes one or even both channels, and the mapping between > logical and physical channels is unreliable. Any attempt by > userspace to drive the hardware volume therefore results in muted > or one-sided audio. > > Ignore the playback feature unit via a usbmix_name_map so that > userspace falls back to software volume, and pin the unit's master > and per-channel volumes to the reported maximum with mutes cleared > when the mixer is created, so the signal path always stays fully > open. The capture path (microphone feature unit) is not affected > and keeps working. > > Tested with a Redragon H878 wireless headset on PipeWire/PulseAudio: > stereo output works on both channels at any volume, software volume > applies smoothly, and mute/unmute works. > > Cc: stable@vger.kernel.org > Signed-off-by: Cristiano Souza Applied to for-next branch. Thanks. Takashi