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[221.49.92.147]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29bceb40276sm56054805ad.73.2025.11.28.16.32.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Nov 2025 16:32:45 -0800 (PST) From: Vishnu Sankar To: corbet@lwn.net, dmitry.torokhov@gmail.com, hmh@hmh.eng.br, derekjohn.clark@gmail.com, hansg@kernel.org, ilpo.jarvinen@linux.intel.com Cc: mpearson-lenovo@squebb.ca, linux-doc@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, ibm-acpi-devel@lists.sourceforge.net, platform-driver-x86@vger.kernel.org, vsankar@lenovo.com, Vishnu Sankar Subject: [PATCH v4 3/3] Documentation: thinkpad-acpi - Document doubletap_filter attribute Date: Sat, 29 Nov 2025 09:25:33 +0900 Message-ID: <20251129002533.9070-4-vishnuocv@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251129002533.9070-1-vishnuocv@gmail.com> References: <20251129002533.9070-1-vishnuocv@gmail.com> 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" Document the doubletap_filter sysfs attribute for ThinkPad ACPI driver. Signed-off-by: Vishnu Sankar --- .../admin-guide/laptops/thinkpad-acpi.rst | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Document= ation/admin-guide/laptops/thinkpad-acpi.rst index 4ab0fef7d440..a1e84d25e151 100644 --- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst +++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst @@ -1521,6 +1521,26 @@ Currently 2 antenna types are supported as mentioned= below: The property is read-only. If the platform doesn't have support the sysfs class is not created. =20 +doubletap_filter +---------------- + +sysfs: doubletap_filter + +Controls whether TrackPoint doubletap events are filtered out. Doubletap i= s a +feature where quickly tapping the TrackPoint twice triggers a special func= tion key event. + +The available commands are:: + + cat /sys/devices/platform/thinkpad_acpi/doubletap_filter + echo 1 | sudo tee /sys/devices/platform/thinkpad_acpi/doub= letap_filter + echo 0 | sudo tee /sys/devices/platform/thinkpad_acpi/doub= letap_filter + +Values: + * 0 - doubletap events are processed (default) + * 1 - doubletap events are filtered out (ignored) + + This setting can also be toggled via the Fn+doubletap hotkey. + Auxmac ------ =20 --=20 2.51.0