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Fri, 13 Nov 2026 08:05:32 -0800 (PST) Received: from localhost ([2a00:79e0:2ebe:8:48f1:7a0b:9bfb:4205]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-379553316fdsm8743311eec.5.2026.11.13.08.05.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Nov 2026 08:05:30 -0800 (PST) Date: Fri, 13 Nov 2026 08:05:30 -0800 Message-ID: From: Dmitry Torokhov To: Nick Green Cc: Dmitry Mikushin , "linux-input@vger.kernel.org" Subject: Re: [REPORT] synaptics_intertouch on ThinkPad T14 Gen 2 (LEN2072) In-Reply-To: References: X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Disposition: inline Hi Nick, On Sat, Aug 29, 2026 at 08:44:23PM +0000, Nick Green wrote: > Following up on my previous report regarding synaptics_intertouch on the ThinkPad T14 Gen 2 (PNP: LEN2072). > > After further daily-use testing, please DO NOT add LEN2072 to the smbus_pnp_ids whitelist. > > Key findings: > 1. Under psmouse.synaptics_intertouch=1 (RMI4/SMBus), the touchpad exhibits intermittent tap-to-click failures during natural use. > 2. Low-level event debugging via 'libinput measure touchpad-pressure' confirmed that missed taps produce zero evdev events at the kernel level—momentary tap interrupts are being dropped by the SMBus controller before reaching userspace, while continuous swiping and pointer motion transmit normally. Dmitry Mikushin (CCed) recently tracked down a performance issue with Synaptics TM3471 (LEN2072) over SMBus where rmi_f12 was reading the entire 79-byte F12 data packet on every attention interrupt (requiring three SMBus block reads and taking ~17.4 ms per frame, which capped the report rate at ~43 Hz), even though only the first 32 bytes (Data1) are used. Could you please test his patch series (now in the input next branch) that limits the F12 read to Data1 and enables SMBus for LEN2072, and let us know if it resolves the missed taps on your T14 Gen 2: https://lore.kernel.org/linux-input/20261026142648.2567233-1-dmitry@kernelgen.org/ Thanks. -- Dmitry