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[83.28.83.135]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47febfda0d7sm3340581f8f.2.2026.08.04.14.55.17 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Tue, 04 Aug 2026 14:55:19 -0700 (PDT) Date: Tue, 4 Aug 2026 23:55:15 +0200 From: Michal Pecio To: Rong Zhang Cc: Jaroslav Kysela , Takashi Iwai , Icenowy Zheng , linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/3] ALSA: usb-audio: Do not expose sticky mixers Message-ID: <20260804235515.7346606e.michal.pecio@gmail.com> In-Reply-To: <20260411-uac-sticky-mixer-v1-3-29d62717befd@rong.moe> References: <20260411-uac-sticky-mixer-v1-0-29d62717befd@rong.moe> <20260411-uac-sticky-mixer-v1-3-29d62717befd@rong.moe> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sat, 11 Apr 2026 01:49:04 +0800, Rong Zhang wrote: > Some devices' mixers are sticky, which accept SET_CUR but do absolutely > nothing. Registering these mixers confuses userspace and results in > ineffective volume control. > > Check if a mixer is sticky by setting the volume to the maximum or > minimum value and checking for effectiveness afterward. Prevent the > mixer from being registered if it turns out to be sticky. > > Quirky device sample: > > usb 7-1: New USB device found, idVendor=0e0b, idProduct=fa01, bcdDevice= 1.00 > usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > usb 7-1: Product: Feaulle Rainbow > usb 7-1: Manufacturer: Generic > usb 7-1: SerialNumber: 20210726905926 > (Mic Capture Volume) > > Signed-off-by: Rong Zhang This appears to break (yet another) device, as reported below. Not 100% sure because both affected users ran away to -lts and appear to be of the "won't compile kernel patches" variety. https://bbs.archlinux.org/viewtopic.php?id=314220 My $.02 - was there no way to deal with this in userspace, or to make it opt-in rather than opt-out? Regards, Michal