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[177.4.161.87]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2ed1c070523sm2093806eec.19.2026.04.29.06.04.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Apr 2026 06:04:43 -0700 (PDT) Message-ID: Date: Wed, 29 Apr 2026 10:04:38 -0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] ALSA: ac97: drop stale CMI9738 PCM-volume quirk To: Takashi Iwai Cc: Takashi Iwai , Jaroslav Kysela , linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260429-ac97-cmi9738-pcm-volume-v1-1-d3f90cc00604@gmail.com> <87h5ouos8m.wl-tiwai@suse.de> From: =?UTF-8?Q?C=C3=A1ssio_Gabriel_Monteiro_Pires?= Content-Language: en-US In-Reply-To: <87h5ouos8m.wl-tiwai@suse.de> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------p0GITUeVMg0bwkw1oimDtb2h" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------p0GITUeVMg0bwkw1oimDtb2h Content-Type: multipart/mixed; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 4/29/26 09:39, Takashi Iwai wrote: > On Wed, 29 Apr 2026 14:05:31 +0200, > C=C3=A1ssio Gabriel wrote: >> >> patch_cm9738() still carries an old comment claiming that CMI9738 >> has no PCM volume although AC97_PCM reacts, and then forces >> AC97_HAS_NO_PCM_VOL. >> >> The CMI9738 datasheet documents register 0x18 as "PCM Out Vol" >> with mute and left/right volume fields, so that old assumption is >> not justified. >=20 > Well, that's actually the part the FIXME points to. Although the spec > shows the register is available and the chip reads out, the volume > didn't seem reacting properly on the real hardware, as far as I > remember correctly. >=20 > So, it's really doubtful whether it's safe to cut off this workaround > just by reading the data sheet. Yes, that matches what I suspected at first glance; I wanted to confirm whether the datasheet was enough to revisit the old workaround. > thanks, >=20 > Takashi --=20 Thanks, C=C3=A1ssio --------------vP7ADpzMsjtDFwv0PTyOtC0m-- --------------p0GITUeVMg0bwkw1oimDtb2h Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wnsEABYIACMWIQSrYqI5vIrg1X9eqEjQXT8aWv/ugwUCafIB5gUDAAAAAAAKCRDQXT8aWv/ug5SX AP0Yum7Eac5IXqFSoWIQT1OBuK37ilvy6DNOKqr+WZPikwEA7JNo3F6Jr6dPBUk3P2TxOwsrISBX 3CwIZThngFHnFAI= =Oyxn -----END PGP SIGNATURE----- --------------p0GITUeVMg0bwkw1oimDtb2h--