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Thu, 15 Oct 2026 07:19:54 +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 m/YWJJp+0GokOAAAD6G6ig (envelope-from ); Thu, 15 Oct 2026 07:19:54 +0000 Date: Thu, 15 Oct 2026 09:19:54 +0200 Message-ID: <87pkxbmnvp.wl-tiwai@suse.de> From: Takashi Iwai To: wangdich9700@163.com Cc: tiwai@suse.com, perex@perex.cz, wangdicheng@kylinos.cn, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] ALSA: hda/realtek: Limit Line In boost and ADC gain on DECENTA MATX03 In-Reply-To: <20261015021210.106392-1-wangdich9700@163.com> References: <20261015021210.106392-1-wangdich9700@163.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 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 [-3.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; ARC_NA(0.00)[]; FREEMAIL_TO(0.00)[163.com]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVRCPT(0.00)[163.com]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,kylinos.cn:email] X-Spam-Score: -3.30 X-Spam-Level: X-Spam-Flag: NO On Thu, 15 Oct 2026 04:12:10 +0200, wangdich9700@163.com wrote: > > From: wangdicheng > > The DECENTA MATX03 (ALC897, SSID 1e0b:1297) exposes a high gain > range on both the Line In pin boost and the ADC input amp. Pin 0x1a > reports nsteps=0x03 with stepsize=0x27, that is 0, 9.75, 19.5 and > 29.25 dB. ADC 0x08 reports nsteps=0x3f with stepsize=0x02, that is > 0 to 31.5 dB in 0.5 dB steps, and defaults to 0x3f (maximum). The > combined 60.75 dB analogue cascade overloads the front-end when the > source level is high, producing audible noise during Line In > monitoring. > > Add a new fixup alc897_fixup_limit_linein_boost that overrides the > amp capabilities of pin 0x1a to nsteps=1 (max ~11.75 dB) and ADC > 0x08 to nsteps=1 (max ~0.5 dB). The total gain drops from 60.75 dB > to ~12.25 dB, eliminating the clipping. > > Signed-off-by: wangdicheng Applied to for-next branch. Thanks. Takashi