From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8B83D5038F1; Thu, 17 Sep 2026 17:09:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789664964; cv=none; b=BYsC82iF8zApLY3nfOk5+LCi14SAVgu6B06Hfes1Q415MIvcMWRNlI3f1G7vltMABL56XlgBPwCqM7cFKJRMtdLIoOFiTgeVkVaY9OBrjUzYjn3tP3KCQJ478LzG4x7V8jfxEgyQObTn38VJkVJ5ys6vnno9uvq5wEXLvaOvNtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789664964; c=relaxed/simple; bh=xZXqvsKNv7hTFBY4XGqtszYHAvzhrd80Mm+bt3KiRYc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HsPnPm3NK9M3BTn969SPQlBTolfJMGfdOkCuu4VyPrgTIVCENDnCheQT3SK/WbibPx3faTbJB4ffxWCNPVfdOwX1a8ygpJUowHk/rQdO1z12wyLnIME11K/V79cYjGXsqmESH+7rmknYuL1OZDNQ7SCj6ywFhBxsTgwqpM3QSE4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=R3PKQq4q; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="R3PKQq4q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE37D1F000FF; Thu, 17 Sep 2026 17:09:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789664963; bh=s6QZMdrhS2HRszzqIZxBuQYB/DyBO79MEORfvfWMvOU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=R3PKQq4qARXmb149KDDbXvm38zBV74CKri4a5L13mxdo59NNlodCoDTqa4BslDOpB 85EHrFK6CD/U94dpIZfHBsY/vPe+Sxd1Ep/W3JXsQ/R9OgvPvswwUQXWw5dMxyQ1+N MLQE+dcNv+GcwW7mEeVzZA1BVXLYQ+JxVqJff+2g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Markus Lindner , Takashi Iwai , Sasha Levin Subject: [PATCH 6.18 0546/1250] ALSA: usb-audio: Add dB map quirk for Razer Barracuda X 2.4 Date: Thu, 17 Sep 2026 16:05:41 +0100 Message-ID: <20260917151606.735276515@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151551.901433442@linuxfoundation.org> References: <20260917151551.901433442@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Markus Lindner [ Upstream commit acd8aa3c4b91a38c8521000790890bc9d1083f1d ] The Razer Barracuda X 2.4 GHz USB headset dongle (0x1532:0x0552) reports a minimum volume register value of cval->min = -16800. In UAC 1/256 dB units, -16800 corresponds to -65.625 dB. However, stock ALSA misinterprets this raw integer as 1/100 dB units (-168.00 dB), causing user-space audio servers (PipeWire / PulseAudio) to map their volume curves against an incorrectly wide range. Add an explicit usbmix_dB_map entry overriding Unit 2 to -6562 (-65.62 dB) to accurately report the physical hardware attenuation bounds. Signed-off-by: Markus Lindner Link: https://patch.msgid.link/AS8P195MB2142F4EFF83980BD02BA6566E1C12@AS8P195MB2142.EURP195.PROD.OUTLOOK.COM Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/mixer_maps.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c index faac7df1fbcf0..4d8dca04f87d0 100644 --- a/sound/usb/mixer_maps.c +++ b/sound/usb/mixer_maps.c @@ -344,6 +344,16 @@ static const struct usbmix_name_map bose_soundlink_map[] = { { 0 } /* terminator */ }; +/* + * Razer Barracuda X 2.4: Firmware reports cval->min = -16800 in 1/256 dB units + * (-65.62 dB), which stock ALSA misinterprets as a -168 dB floor + */ +static const struct usbmix_dB_map razer_barracuda_x_2_4_dB = {-6562, 0}; +static const struct usbmix_name_map razer_barracuda_x_2_4_map[] = { + { 2, NULL, .dB = &razer_barracuda_x_2_4_dB }, + { 0 } /* terminator */ +}; + /* Sennheiser Communications Headset [PC 8], the dB value is reported as -6 negative maximum */ static const struct usbmix_dB_map sennheiser_pc8_dB = {-9500, 0}; static const struct usbmix_name_map sennheiser_pc8_map[] = { @@ -689,6 +699,11 @@ static const struct usbmix_ctl_map usbmix_ctl_maps[] = { .id = USB_ID(0x17aa, 0x1046), .map = lenovo_p620_rear_map, }, + { + /* Razer Barracuda X 2.4 */ + .id = USB_ID(0x1532, 0x0552), + .map = razer_barracuda_x_2_4_map, + }, { /* Sennheiser Communications Headset [PC 8] */ .id = USB_ID(0x1395, 0x0025), -- 2.53.0