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Mon, 06 Jul 2026 09:51:04 -0700 (PDT) Message-ID: Date: Mon, 6 Jul 2026 22:20:59 +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: <49faacb7-3e01-4d01-80b1-4b939a904138@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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