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Mon, 29 Sep 2025 15:20:59 +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 i/L8KNuj2mhsQgAAD6G6ig (envelope-from ); Mon, 29 Sep 2025 15:20:59 +0000 Date: Mon, 29 Sep 2025 17:20:59 +0200 Message-ID: <87bjmtmgis.wl-tiwai@suse.de> From: Takashi Iwai To: Sidharth Seela Cc: perex@perex.cz, tiwai@suse.com, zhujun2@cmss.chinamobile.com, kuninori.morimoto.gx@renesas.com, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC]sound:usb:mixer.c: Solving 'Generic AB13X USB Audio' Unlikely volume range. In-Reply-To: <20250929133752.31847-1-sidharthseela@gmail.com> References: <20250929133752.31847-1-sidharthseela@gmail.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_DN_SOME(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_TO(0.00)[gmail.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCPT_COUNT_SEVEN(0.00)[7]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:dkim,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns] X-Spam-Flag: NO X-Spam-Level: X-Rspamd-Queue-Id: E88E420C45 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Score: -3.51 On Mon, 29 Sep 2025 15:37:52 +0200, Sidharth Seela wrote: > > Dear Maintainers, > I am using a generic "boat" make earphones, which are too loud across > different systems with eg: iOS, macOS, Debian Linux. And hence I believe > the issue is not with a driver but the headphones. > > After connecting this device to laptop I get the following in dmesg logs: > usb 1-5: New USB device found, idVendor=001f, idProduct=0b21, bcdDevice= 1.00 > usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > usb 1-5: Product: AB13X USB Audio > usb 1-5: Manufacturer: Generic > usb 1-5: SerialNumber: 20210726905926 > usb 1-5: Warning! Unlikely big volume range (=11520), cval->res is probably wrong. > usb 1-5: [2] FU [PCM Playback Volume] ch = 2, val = -11520/0/1 > usb 1-5: Warning! Unlikely big volume range (=8191), cval->res is probably wrong. > usb 1-5: [5] FU [Mic Capture Volume] ch = 1, val = 0/8191/1 > > By using pavucontrol, I am able to get fair sound, after reducing 17dB in > Analog Stereo Output and reducing 6dB in Digital Stereo Output. > > I believe this issue could be solved by adding a quirk patch to > sound/usb/mixer.c:1096 (/* volume control quriks */). An oft-seen firmware bug is that it provides the wrong mixer range that confuses the driver. USB audio firmware should provide the above volume range in 1/256 dB level. Try to figure out the volume level and you'd need to hard-code the actual volume range there for your device. Takashi