Talk:Laptop Mode Tools

From ArchWiki
Latest comment: 14 October 2017 by Lahwaacz in topic frequency scaling

acpid and dbus

I'd like to see some more explanation of how all of these power management/laptop subsystems relate to each other. Do I need acpid now that udev and dbus exist? Will laptop mode tools talk to pm-suspend to initiate suspend on lid close? Or can this be signalled by dbus, or acpid? --VitaminJ 19:32, 5 February 2011 (EST)

I'm pretty sure you do need acpid, else the events aren't picked up. It seems there are some LM connected scripts in the /etc/acpi/ directories, but they don't really do much besides enabling/disabling LM. I guess that's up to the user to decide, but you could provide some suggestions on the wiki for these scripts.--Smartass 10:18, 20 March 2011 (EDT)

Laptop-mode-tools does not disable on AC

I think the command should be:

# touch /etc/pm/power.d/laptop-mode

because in /usr/lib/pm-utils/power.d/ there is a "laptop-mode" file

pm-utils version :1.4.1-5 —This unsigned comment is by Tsester (talk) 01:03, 2 January 2013‎. Please sign your posts with ~~~~!

frequency scaling

The suggestions about disabling intel_pstate should at least be hedged with appropriate warnings, since the advice here flatly contradicts almost everything else I've read in this wiki, on the forums and elsewhere. --cfr (talk) 03:54, 13 October 2017 (UTC)Reply[reply]

Agreed. I have removed that change as it is significant enough to warrant discussion. Jasonwryan (talk) 07:36, 13 October 2017 (UTC)Reply[reply]
Disabling intel_pstate definitely does not bring more power saving, the benefits come from enforcing the lowest frequency all the time. This is possible even with intel_pstate (e.g. cpupower frequency-set --max <number>) but laptop-mode-tools might have some configuration quirks. -- Lahwaacz (talk) 13:02, 14 October 2017 (UTC)Reply[reply]