Hi, thanks for the report. From the dmesg log, it looks like the kernelspace fan control may be handled by the dell-smm-hwmon driver. This driver exposes a sysfs interface to manage the fans, so I'm curious if directly modifying them will have an effect. This Github gist [1] has some ideas on that topic as well.
For example, first you can find the relevant hwmonX interface (where X is a number) by finding the one with dell_smm in the name: $ grep dell_smm /sys/class/hwmon/hwmon*/name From there, maybe try manually enabling firmware fan control: $ echo 2 | sudo tee /sys/class/hwmon/hwmonX/pwm1_enable Or try setting the fan speed via a PWM value 0-255 (e.g. 192): $ echo 192 | sudo tee /sys/class/hwmon/hwmonX/pwmX # X is whichever fan numbers are available Do either of those have any effect on fan speed? Apologies if you've already looked into this. [1] https://github.com/lm-sensors/lm-sensors/issues/459 ** Bug watch added: github.com/lm-sensors/lm-sensors/issues #459 https://github.com/lm-sensors/lm-sensors/issues/459 ** Changed in: linux-hwe-6.14 (Ubuntu) Assignee: (unassigned) => Noah Wager (nwager) ** Changed in: linux-hwe-6.14 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2118621 Title: Dell G15 fans run at full speed on Ubuntu despite low system temperatures. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.14/+bug/2118621/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
