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Sat, 28 Mar 2026 22:40:59 -0700 (PDT) Received: from cachyos-x8664.iitd.ac.in ([2001:df4:e000:3fd2:59eb:b75c:7ede:19e7]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b242670302sm39144395ad.26.2026.03.28.22.40.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Mar 2026 22:40:59 -0700 (PDT) From: Bani Brata To: platform-driver-x86@vger.kernel.org Cc: Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-kernel@vger.kernel.org, Bani Brata Subject: [PATCH] platform/x86: hp-wmi: Hide bogus fan RPM on HP ENVY x360 13-bd0xxx Date: Sun, 29 Mar 2026 11:10:50 +0530 Message-ID: <20260329054052.32023-1-banibrata2007@gmail.com> X-Mailer: git-send-email 2.53.0 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" On the HP ENVY x360 Convertible 13-bd0xxx (board 8824), the WMI interfaces for reading fan speed (HPWMI_FAN_SPEED_GET_QUERY) return zero-filled buffers regardless of the actual fan speed. This results in the hp_wmi driver exposing `fan1_input` and `fan2_input` nodes through hwmon that permanently report "0 RPM", which is misleading and interferes with userspace sensor monitoring tools. Add a DMI quirk to disable exposing the hwmon fan nodes on this specific board. Signed-off-by: Bani Brata --- drivers/platform/x86/hp/hp-wmi.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/platform/x86/hp/hp-wmi.c b/drivers/platform/x86/hp/hp-= wmi.c index XXXXXXX..XXXXXXX 100644 --- a/drivers/platform/x86/hp/hp-wmi.c +++ b/drivers/platform/x86/hp/hp-wmi.c @@ -192,6 +192,18 @@ static const struct dmi_system_id hp_wmi_rfkill_dmi_ta= ble[] __initconst =3D { }; =20 static bool is_victus_s_board; +static bool is_envy_x360_8824_board; + +static const struct dmi_system_id hp_envy_x360_8824_boards[] __initconst = =3D { + { + .matches =3D { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY x360 Convertible 13-bd0xxx"), + DMI_MATCH(DMI_BOARD_NAME, "8824"), + }, + }, + {}, +}; =20 enum hp_wmi_radio { HPWMI_WIFI =3D 0x0, @@ -2166,6 +2178,8 @@ static umode_t hp_wmi_hwmon_is_visible(const void *da= ta, case hwmon_pwm: return 0644; case hwmon_fan: + if (is_envy_x360_8824_board) + return 0; if (is_victus_s_thermal_profile()) { if (hp_wmi_get_fan_speed_victus_s(channel) >=3D 0) return 0444; @@ -2188,6 +2202,8 @@ static int hp_wmi_hwmon_read(struct device *dev, enum= hwmon_sensor_types type, =20 switch (type) { case hwmon_fan: + if (is_envy_x360_8824_board) + return -EOPNOTSUPP; if (is_victus_s_thermal_profile()) ret =3D hp_wmi_get_fan_speed_victus_s(channel); else @@ -2281,6 +2297,8 @@ static int __init hp_wmi_bios_setup(struct platform_d= evice *device) { const struct dmi_system_id *id; =20 + is_envy_x360_8824_board =3D dmi_first_match(hp_envy_x360_8824_boards); + /* * Currently only victus_s devices use the * active_thermal_profile_params --=20 2.48.1