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Fri, 24 Jul 2026 20:42:51 -0700 (PDT) Message-ID: <2210c2c5-5ef5-43b4-b01a-935ef4ee6582@gmail.com> Date: Sat, 25 Jul 2026 09:12:45 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] ideapad_laptop: fans do not ramp up properly under CPU load on Lenovo IdeaPad 3 15ALC6 Ub (82KU) From: Sourajyoti Basak To: platform-driver-x86@vger.kernel.org Cc: mpearson-lenovo@squebb.ca, Derek John Clark , ikepanhc@gmail.com, hansg@kernel.org, ilpo.jarvinen@linux.intel.com, linux-kernel@vger.kernel.org References: <49faacb7-3e01-4d01-80b1-4b939a904138@gmail.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 06/07/26 10:20 pm, Sourajyoti Basak wrote: > On 02/06/26 8:43 pm, Sourajyoti Basak wrote: >> On 09/05/26 9:00 pm, Sourajyoti Basak wrote: >>> Hello, >>> >>> I am using a Lenovo IdeaPad 3 15ALC6 Ub (82KU), and I am encountering an >>> issue where the laptop fans do not respond appropriately to increasing >>> CPU temperatures under Linux. >>> >>> System information: >>> Laptop: Lenovo IdeaPad 3 15ALC6 Ub >>> BIOS version:GLCN46WW >>> System performance mode in BIOS: Extreme Performance >>> Kernel: Linux 7.0.5-1-cachyos >>> Distribution: CachyOS >>> CPU: AMD Ryzen 5 5500U (12) @ 4.06 GHz >>> >>> Issue description: >>> Under sustained CPU load (for example using stress -c $(nproc)), CPU >>> temperatures rapidly increase to around 95-100°C. However, the fans do >>> not ramp to maximum speed as expected. Therefore, the system begins >>> thermal throttling after some time in this state. >>> >>> As a result: >>> >>> - The CPU reaches thermal throttling temperatures. >>> - CPU frequencies drop significantly once throttling begins. >>> - Fan RPM appears capped or insufficient despite high temperatures. >>> - The issue appears consistently reproducible on my laptop and another >>>   person's laptop. >>> >>> Additional observations: >>> >>> - The issue persists across multiple recent kernel versions. >>> - No hardware issues appear to be present. (Verified that the fans can >>> indeed >>>   ramp up to max speed by  >>> `echo 1 | sudo tee /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/ >>> fan_mode`, >>> which makes the fan enter "dust cleaning mode," causing it to ramp up to >>> max speed >>> and then back down to 0 RPM about 10 times.) >>> >>> Attachments: >>> - DSDT in `DSDT.gz` >>> - `dmidecode` in `dmidecode.txt` >>> >>> Data Collected during `stress -c $(nproc)` until thermal throttling: >>> - EC information collected in a CSV file named `ec.csv` >>>   (using `sudo ec_probe monitor -i 0.5 -r ec.csv` from the NBFC project) >>> - `sensors` information in `sensors.log` >>> - CPU frequencies in `cpu-freq.log` >>> - `dmesg` in `dmesg-live.log` >>> >>> Thank you for your time. >>> >>> Best regards, >>> Sourajyoti Basak >> >> >> Hello everyone, >> >> Just a gentle ping on this bug report. The thermal throttling issue is >> still present. Please let me know if there is any further ACPI/EC >> debugging information I can provide. >> >> Best Regards, >> Sourajyoti Basak > > Hello everyone, > > Just wanted to confirm that this issue still exists after updating to > the latest BIOS version (`GLCN68WW`) and on the latest linux kernel > version `Linux 7.1.2-3-cachyos`. > > Best Regards, > Sourajyoti Basak Hello everyone, This issue is still present even on the latest BIOS version (GLCN68WW) and on the latest kernel version `Linux ideapad 7.1.4-1-cachyos` Best Regards, Sourajyoti Basak