The uswsusp ('Userspace Software Suspend') is a wrapper around the kernel's suspend-to-RAM mechanism, which performs some graphics adapter manipulations from userspace before suspending and after resuming. On modern kernels, writing appropriate strings to /sys/power/state is the primary mechanism to trigger this suspend. The most straightforward approach is to directly inform the in-kernel software suspend code (swsusp) to enter a suspended state the exact method and state depends on the level of hardware support. Using low level interfaces directly is significantly faster than using any high level interface, since running all the pre- and post-suspend hooks takes time, but hooks can properly set hardware clock, restore wireless etc. Though these interfaces can be used directly, it is advisable to use the high level interfaces to suspend/hibernate. There are multiple low level interfaces (backends) providing basic functionality, and some high level interfaces providing tweaks to handle problematic hardware drivers/kernel modules (e.g. If the battery is depleted, the system can be resumed from disk, which is much slower than resuming from RAM, but the machine's state has not been lost. Therefore, if the battery is not depleted, the system can resume instantly. Saves the machine's state into swap space, but does not power off the machine. Hybrid suspend A hybrid of suspending and hibernating, sometimes called suspend to both. Until then, there is zero power consumption. When the machine is powered on, the state is restored. Saves the machine's state into swap space and completely powers off the machine. Suspend to disk (aka hibernate) The S4 sleeping state as defined by ACPI. Because of the large power savings, it is advisable for laptops to automatically enter this mode when the computer is running on batteries and the lid is closed (or the user is inactive for some time). Works by cutting off power to most parts of the machine aside from the RAM, which is required to restore the machine's state. Suspend to RAM (aka suspend, aka sleep) The S3 sleeping state as defined by ACPI. On Arch Linux, install wol, the command to wake up a WoL enabled computer.Tip: While this state is subject to battery drain issues on Windows or macOS since they support waking devices in this state for network activity, the Linux software ecosystem does not currently make use of this feature and should be unaffected. Different BIOS may call it different names but generally it’s to allow the system to power on by PCI/Network. Save it and restart, run ` sudo ethtool enp0s31f6` and if the following line appears in the output then it's a success! Wake-on: g It’s trivial to mention how to shutdown a Linux server via SSH, however to my surprise it’s not any harder to turn on a Linux server using WoL.įirst on the server, make sure the line `ethernet-wol g` exists under the interface. To avoid a big surge on my next electricity bill, I plan to only turn on the server when the sun is shining or during off peak when electricity is cheaper. I’ve just built a home server running Ubuntu Linux, using consumer grade PC parts. The Internet servers are usually on 24×7, probably that’s why I never had the need to use the Wake on LAN feature on a computer.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |