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[203.129.195.130]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-842828821d0sm97645b3a.28.2026.06.02.08.13.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 02 Jun 2026 08:13:35 -0700 (PDT) Message-ID: <49faacb7-3e01-4d01-80b1-4b939a904138@gmail.com> Date: Tue, 2 Jun 2026 20:43:26 +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: Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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