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Thu, 22 Oct 2026 06:13:10 +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 11hNKXap2WpUHQAAD6G6ig (envelope-from ); Thu, 22 Oct 2026 06:13:10 +0000 Date: Thu, 22 Oct 2026 08:13:10 +0200 Message-ID: <875wyue009.wl-tiwai@suse.de> From: Takashi Iwai To: songxiebing Cc: tiwai@suse.com, perex@perex.cz, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ALSA: hda/generic: Use "Input Source" for the capture source selector In-Reply-To: <20261022025743.520258-1-songxiebing@kylinos.cn> References: <20261022025743.520258-1-songxiebing@kylinos.cn> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 X-Mailing-List: linux-kernel@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 [-12.51 / 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]; 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)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; 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)[]; RCPT_COUNT_FIVE(0.00)[5]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[kylinos.cn:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:dkim]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -12.51 X-Spam-Level: X-Rspamd-Queue-Id: 26D2921EA2 On Thu, 22 Oct 2026 04:57:43 +0200, songxiebing wrote: > > From: Bob Song > > The generic parser names the capture-source selector "Capture Source" when a > single ADC is used, and "Input Source" when multiple ADCs are handled > (including the dynamic ADC switching case). Commit 624d914d091a > ("ALSA: hda - Use "Capture Source" for single sources") introduced this > split to keep the nicer name for the common single-ADC case, because > "Capture Source" doesn't work well with the alsa-lib simple-mixer > abstraction when multiple instances are present. > > However, alsa-lib expands a control named "Capture Source" into one > simple-mixer element per enum item (an exclusive capture switch per input), > so there is no enumerated simple-mixer element named "Capture Source" for > userspace to look up. PulseAudio's ALSA backend resolves its input-source > element by name via snd_mixer_find_selem() and therefore cannot find the > selector, leaving the capture source uncontrollable on such single-ADC > systems. > > "Input Source" is mapped by alsa-lib to a single enumerated element and > works for both the single- and multi-ADC cases. Use it unconditionally. It must be rather a problem of PulseAudio, and it should be able to handle Capture Source, as it's been used for most of old AC97-based cards. Reverting this old behavior change (since 14 years ago!) is just no-go. thanks, Takashi