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Wed, 16 Sep 2026 07:53:13 -0700 (PDT) Sender: Guenter Roeck Date: Wed, 16 Sep 2026 07:53:12 -0700 From: Guenter Roeck To: Patrick Pepin Cc: Pali =?iso-8859-1?Q?Roh=E1r?= , Armin Wolf , linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist Message-ID: <4e5f8714-4257-484f-8f8c-0fc8033ecab6@roeck-us.net> References: <20260913112925.11393-1-patpep@me.com> <20260914080955.87925-1-patpep@me.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260914080955.87925-1-patpep@me.com> On Mon, Sep 14, 2026 at 08:09:55AM +0000, Patrick Pepin wrote: > On the Dell Precision 3650 Tower, the EC ignores fan speed writes unless > automatic BIOS fan control is disabled first. The I8K_FAN_30A3_31A3 SMM > code pair works on this machine through the WMI-SMM backend: after > writing 1 to pwm1_enable, all three fans (CPU, front, top) accept the > three fan states and report matching RPM, and writing 2 hands control > back to the BIOS. I8K_FAN_34A3_35A3 was tested as well and also works; > I8K_FAN_30A3_31A3 is used since it matches recent OEM software. > > Tested on BIOS 1.48.0 with kernels 7.0.0-30 and 7.0.0-31 (Ubuntu 26.04). > > Signed-off-by: Patrick Pepin > Acked-by: Pali Rohár Applied. Thanks, Guenter