![]() Observe there are two USE flags that seem to collide: acpi and apm. The laptop (and kernel) support bluetooth.ĭepend on sys-apps/sdparm, enabling laptop-mode-tools to manage SCSI ( and not SATA) disk parameters. The laptop is not too old (around year 2003 and later).ĭepend on sys-apps/apmd so that changes in the system are captured and power saving features are automatically enabled/disabled.ĭepend on net-wireless/bluez, enabling laptop-mode-tools to manage bluetooth settings (enabling/disabling the service based on battery availability) So let's first take a look at the supported USE flags and what they mean to the package.ĭepend on sys-power/acpid so that changes in the system are captured and power saving features are automatically enabled/disabled. However, this package takes on additional, optional settings through USE flag configuration. Root # emerge -ask app-laptop/laptop-mode-tools To enable proper power management features in the Linux kernel, enable the following settings: We recommend using sys-kernel/gentoo-sources, but if advanced hibernation support is desired, TuxOnIce might be needed. There are different kernel sources in Portage sys-kernel. ![]() Linux kernel configuration Minimum kernel setup It allows managing the laptop_mode setting in the Linux kernel, but has additional features that allow the tweaking of other power-related settings on the system. The Laptop Mode Tools is a software package ( app-laptop/laptop-mode-tools) which allows the user to optimize power saving functions. The laptop_mode setting is an in-kernel configuration setting that optimizes I/O, allowing disks to spin down properly (and not be woken up immediately afterwards for queued operations). In such cases, the feature from the laptop mode tools must be disabled so that both tools do not fight over the same resource control. However, we will also refer to other tools that might offer a more detailed approach on individual settings. ![]() Within this document, the primary focus will be on laptop mode tools since it offers a complete set of functionalities. ![]() Please be careful when applying this on a non-laptop system. Although some of the information in this guide can be applied to power management for servers, it is not the intention of this document to go that route. This document describes the setup of power management features for laptops. 3.4 Configuring CPU frequency management. ![]()
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