https://bugzilla.kernel.org/show_bug.cgi?id=212939 Bug ID: 212939 Summary: thinkpad_acpi reports balanced in /sys/firmware/acpi/platform_profile when thermal throttling Product: Drivers Version: 2.5 Kernel Version: 5.12 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Platform_x86 Assignee: drivers_platform_x86@xxxxxxxxxxxxxxxxxxxx Reporter: jwrdegoede@xxxxxxxxxxxxxxxxx Regression: No The platform-profile interface implemented by thinkpad_acpi and available through the /sys/firmware/acpi/platform_profile, should reflect the last user selected value. Where the user-selected value is either the last value written to the sysfs file, or selected through Fn + L / M / H. Key combinations. When in performance mode and the CPU temperature goes over 97 degrees Celcius the embedded-controller will temporarily drop back to balanced mode to give the CPU a chance to cool-down a bit. This is fine as an internal implementation detail, but this should not be visible inside the /sys/firmware/acpi/platform_profile interface (1). Having it visible here causes problems for userspace. E.g. the selected profile visible in the power-panel of gnome-control-center can be seen jumping between Performance and Balanced all the time, as if the user is pressing Fn + H, Fn + M, Fn + H, ... all the time. Note this is not so much a kernel bug as that it seems to be a problem with the firmware interface which thinkpad_acpi is using. As such this bugzilla.kernel.org entry is purely meant for tracking this issue, IOW a kernel fix for this will not be forthcoming, but hopefully we can get Lenovo to fix this on the firmware side. 1) The information about the thermal limits leading to temporary dropping back to balanced mode could be exported elsewhere, like how lapmode is exported through: /sys/bus/platform/devices/thinkpad_acpi/dytc_lapmode -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
