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(host179.190-30-68.telecom.net.ar. [190.30.68.179]) by smtp.gmail.com with ESMTPSA id a1e0cc1a2514c-982ba1789b8sm13201793241.13.2026.09.14.19.05.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2026 19:05:27 -0700 (PDT) From: Daniel Salmun To: Henrique de Moraes Holschuh , Mark Pearson , "Derek J . Clark" , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Cc: ibm-acpi-devel@lists.sourceforge.net, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Salmun Subject: [PATCH] platform/x86: thinkpad_acpi: Fix fan speed reporting on ThinkPad L440 Date: Mon, 14 Sep 2026 23:05:03 -0300 Message-Id: <20260915020503.18987-1-salmundani@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The L440 (BIOS J4ET93WW) reports its fan as stopped: /proc/acpi/ibm/fan shows "status: disabled" and "speed: 0", and hwmon fan1_input is 0 under any load. EC registers 0x2F and 0x84/0x85 always read 0 on this model. The EC uses the 0x93/0x95 layout handled by TPACPI_FAN_NS. 0x93 reads 4 (FAN_NS_CTRL_STATUS) and 0x95 goes from 255 at idle to about 111 at full speed. The DSDT has no fan methods. Add model ID "J4" to fan_quirk_table. The fan then reads about 1900 RPM at idle and 2900 RPM under load. Tested on a ThinkPad L440 20ASS20200 with BIOS J4ET93WW and EC J4HT30WW. Link: https://github.com/lm-sensors/lm-sensors/issues/510 Signed-off-by: Daniel Salmun --- Manual fan control works on this EC (0x93 =3D 0x14, target written to 0x94) but is not part of this patch. I have not checked FAN_RPM_CAL_CONST against a real tachometer. With it the range is 1927-4428 RPM, which fits the 5 V blower in this machine. The L540 uses the same EC firmware and probably needs the same entry, but I don't have one to check its model ID. drivers/platform/x86/lenovo/thinkpad_acpi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform= /x86/lenovo/thinkpad_acpi.c index 1661f070c..c63e54eaa 100644 --- a/drivers/platform/x86/lenovo/thinkpad_acpi.c +++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c @@ -8846,6 +8846,7 @@ static const struct tpacpi_quirk fan_quirk_table[] __= initconst =3D { TPACPI_Q_LNV3('R', '1', 'D', TPACPI_FAN_NS), /* 11e Gen5 GL-R */ TPACPI_Q_LNV3('R', '0', 'V', TPACPI_FAN_NS), /* 11e Gen5 KL-Y */ TPACPI_Q_LNV('H', '3', TPACPI_FAN_NS), /* Edge E330 */ + TPACPI_Q_LNV('J', '4', TPACPI_FAN_NS), /* L440 */ TPACPI_Q_LNV3('N', '1', 'O', TPACPI_FAN_NOFAN), /* X1 Tablet (2nd gen) */ TPACPI_Q_LNV3('R', '0', 'Q', TPACPI_FAN_DECRPM),/* L480 */ TPACPI_Q_LNV('8', 'F', TPACPI_FAN_TPR), /* ThinkPad x120e */ base-commit: cee9395acd8043be0644b25c34bfa86623f2b935 --=20 2.34.1