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Fri, 15 May 2026 06:55:35 +0000 Date: Fri, 15 May 2026 08:55:35 +0200 Message-ID: <878q9lupp4.wl-tiwai@suse.de> From: Takashi Iwai To: Simon Wood Cc: perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org Subject: Re: [PATCH] ALSA: M-Audio C600 disable Output Gain Knob In-Reply-To: <20260511212458.44142-1-simon@mungewell.org> References: <20260511212458.44142-1-simon@mungewell.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Rspamd-Action: no action 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)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[mungewell.org:email,suse.de:mid,suse.de:dkim,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; URIBL_BLOCKED(0.00)[imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:dkim,mungewell.org:email]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: 271D76B2A1 Message-ID-Hash: W3YRPOZBXDU2M2FHECFCJTLRLTI4BZ4S X-Message-ID-Hash: W3YRPOZBXDU2M2FHECFCJTLRLTI4BZ4S X-MailFrom: tiwai@suse.de X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Mon, 11 May 2026 23:24:58 +0200, Simon Wood wrote: > > The C400/C600 interfaces have a large output gain knob which attenuates > the outputs as stereo pairs (1/2, 3/4 and 5/6). The Windows driver/app > provides a control to disable this knob/behaviour on any/all outputs, > forcing maximum gain on each. > > The 'disable behaviour' is desirable if any outputs are being used for > aux/effects sends, or if interface is being used as a live/matrix mixer. > > This patch adds a control to select which output pairs are affected by > the Output Gain Knob. Default behaviour is to select all outputs. > > Tested on the C600, likely also works for the C400. > > Signed-off-by: Simon Wood Applied to for-next branch. Thanks. Takashi