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Wed, 21 Oct 2026 07:40:36 -0700 (PDT) Received: from quietus.tail91f8a6.ts.net ([94.126.152.114]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3ac4f563bf7sm358271fa.18.2026.10.21.07.40.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 07:40:35 -0700 (PDT) From: Ruslan Koreev To: Lee Jones Cc: Rillian Grant , Sakari Ailus , Andy Shevchenko , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 4/4] leds: flash: lm3643: Describe the LED on the Lenovo ThinkPad X9-15 Gen 1 Date: Wed, 21 Oct 2026 17:40:34 +0300 Message-ID: <20261021144034.1636708-1-koreev.r@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <179198409516.839288.2293417415100693160@kernel.org> References: <20261011191026.149338-1-rillian.grant@gmail.com> <20261011191026.149338-5-rillian.grant@gmail.com> <179198409516.839288.2293417415100693160@kernel.org> X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Lee, We can share the board-description code in ipu-bridge and add flash-leds, as Sakari and Andy suggested, while keeping per-board current settings. Lenovo's packages set IRFlashLedIntensity=30 for the X1 [1] and 40 for the X9 [2]. With both outputs using the same current setting, these convert to nominal totals of 467350 uA and 608050 uA respectively. The X9 result matches Rillian's trace; the X1 result is from static analysis, with live Windows behavior still unverified. My earlier claim that Windows applies a fixed configuration to any LM3643 was too broad: the sensor configuration affects the current request. Both default paths configure a 400 ms controller timeout. Actual mode, pulse duration and continuous-torch limits remain unverified, so these are candidate operating settings rather than established LED limits. Rillian, could you share the relevant SPB trace, including mode, current and timeout writes, together with the installed driver version? [1] https://download.lenovo.com/pccbbs/mobiles/n4oce17w.html [2] https://download.lenovo.com/pccbbs/mobiles/n4cim20w.html Ruslan