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Linux Power Profile Fix on the horizon for Lenovo Legion Devices
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A forthcoming patch promises to resolve longstanding power profile issues plaguing Lenovo Legion laptops and handhelds running Linux, possibly unlocking optimal performance and stability.For users who have struggled with inaccurate reporting and inconsistent behavior, a solution may finally be within reach.
For years, Linux users of Lenovo Legion devices have faced challenges with power profiles, which are crucial for managing performance and battery life. These profiles often misreport statistics, leading to instability, particularly on handheld models where efficient power management is paramount. Now, a new patch developed by independent developer Derek Clark, and first reported by Phoronix, aims to rectify these issues with dedicated support for an “Extreme” mode.
The Core of the Problem: lenovo WMI GameZone Driver
On Linux systems, Lenovo‘s performance modes are governed by the Lenovo WMI gamezone driver. This driver acts as a translator, converting the device’s firmware controls into commands the operating system can understand. However, not all models are designed to handle the “Extreme” power profile, which maximizes PPT/SPL (Package Power Tracking/Specification Power Limit) values. Pushing these limits can strain cooling systems and drastically reduce battery life, as the CPU may draw more power than the battery can safely provide.
“This series adds a new ‘extreme’ platform profile mode and uses it for the lenovo-wmi-gamezone driver,” Clark explained in his patch submission. “It also prevents bugs that are being reported by some users by switching the current deny list to an allow list… These users will still be able to set extreme mode using the Fn+Q keyboard chord, so no functionality is lost. Currently no models have been validated with extreme mode.”
A History of Misreporting and Conflicting Profiles
The issue has been compounded by a flaw in the Lenovo Legion BIOS. the system would sometimes incorrectly indicate support for “Extreme” mode on devices that were not equipped to handle it. while windows, with its native utilities, could circumvent this issue, linux users were often misled, resulting in a frustrating cycle of misidentified profiles.
According to reports, activating “Extreme” mode on unsupported devices would often default to “performance” mode, and even “Performance” mode would revert to “balanced” mode, leading users to believe the system was malfunctioning. Clark’s patch directly addresses this conflict, establishing proper support for “Extreme” mode while keeping it disabled by default.
From Deny List to Allow List: A More Controlled Approach
Previously, the firmware relied on a “deny list” to prevent unsupported models from accessing the “Extreme” profile. This approach, though, contributed to the widespread misreporting. Clark has switched to an “allow list” system, ensuring that only verified devices can utilize the high-performance mode.
Currently, no Lenovo Legion devices have been officially validated for “Extreme” mode on Linux, likely due to the need for thorough testing and to avoid repeating past issues.Though, the change to an allow list represents a notable step forward.
As the patch gains approval,all Lenovo Legion devices on Linux should benefit from accurate power profiles. It’s anticipated that, with further testing, select models will be added to the “Extreme” mode allow list in the near future. This development underscores the growing viability of Linux as a gaming
