Power management is not running in Plasma, no option to start it

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Power management is not running in Plasma, no option to start it

Post by zzora » Mon Dec 31, 2018 5:05 pm

Hi everyone!

My problem is basically this: https://github.com/NixOS/nixpkgs/issues/24563
When I open System Settings as a regular user, it lets me modify the power settings, but the changes have no effect, and I get this error message when I open it as root, the whole power settings page is disabled and can't be modified:
Power Management configuration module could not be loaded.
The Power Management Service appears not to be running.
This can be solved by starting or scheduling it inside "Startup and Shutdown"
However, in the Startup and Shutdown menu there's nothing related to the power management. Session saving is off, and through Synaptic I updated the powerdevil, powerdevil-dev and powerdevil-data packages with no result. It was unable to update powerdevil-dbg, whatever that is.
The ksmserverrc file doesn't contain powerdevil entries, so the solution written in the above linked topic doesn't work for me.

It's really frustrating because whenever I have to leave the laptop for a few minutes, I have to start playing a movie to prevent the screen from switching off. Even though the default setting is to lower the brightness after 5 minutes and switch off after 10, the brightness is lowered after 2 minutes and the screen is switched off after 5, which is the default setting for the battery-powered usage (but the laptop is plugged in and fully charged, so really what the hell). I had a full reinstall recently, but this problem was present in the previous installation too. Is this a common bug? Could a separately installed screensaver overwrite these default settings?

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Re: Power management is not running in Plasma, no option to start it

Post by phd21 » Mon Dec 31, 2018 5:48 pm

Hi zzora

Welcome to the wonderful world of Linux Mint and its excellent forum!

It would help to know more about your system setup. If you run "inxi -Fxzd" and "lsusb" from the console terminal prompt, highlight the results, copy and paste them back here, that should provide enough information.
Phd21: Mint KDE 18.3 & 19, 64-bit Awesome OS, Ancient Dell OptiPlex 780 Core2Duo E8400 3GHz,4gb Ram,256gb SDD, Video: Intel 4 Graphics, DVD Lightscribe. Why I use KDE?:https://opensource.com/life/15/4/9-reasons-to-use-kde

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Re: Power management is not running in Plasma, no option to start it

Post by zzora » Tue Jan 01, 2019 5:10 pm

These are my specs:

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Kernel: 4.10.0-38-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: KDE Plasma 5.8.8 (Qt 5.6.1)
           Distro: Linux Mint 18.3 Sylvia
Machine:   System: FUJITSU product: LIFEBOOK A357
           Mobo: FUJITSU model: FJNBB5C v: 752828-01R8101755
           Bios: FUJITSU // Insyde v: Version 2.02 date: 12/28/2017
CPU:       Dual core Intel Core i3-6006U (-HT-MCP-) cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 7968
           clock speeds: max: 2000 MHz 1: 500 MHz 2: 500 MHz 3: 500 MHz
           4: 499 MHz
Graphics:  Card: Intel Sky Lake Integrated Graphics bus-ID: 00:02.0
           Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa)
           Resolution: 1920x1080@60.02hz
           GLX Renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2)
           GLX Version: 3.0 Mesa 18.0.5 Direct Rendering: Yes
Audio:     Card Intel Sunrise Point-LP HD Audio
           driver: snd_hda_intel bus-ID: 00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.10.0-38-generic
Network:   Card-1: Intel Wireless 7265 driver: iwlwifi bus-ID: 02:00.0
           IF: wlp2s0 state: up mac: <filter>
           Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: 3000 bus-ID: 03:00.0
           IF: enp3s0 state: down mac: <filter>
Drives:    HDD Total Size: 1000.2GB (19.7% used)
           ID-1: /dev/sda model: TOSHIBA_MQ01ABD1 size: 1000.2GB
           Optical: /dev/sr0 model: HL-DT-ST DVDRAM GUD0N
           rev: FL02 dev-links: cdrom,cdrw,dvd,dvdrw
           Features: speed: 24x multisession: yes
           audio: yes dvd: yes rw: cd-r,cd-rw,dvd-r,dvd-ram state: running
Partition: ID-1: / size: 913G used: 180G (21%) fs: ext4 dev: /dev/sda2
           ID-2: swap-1 size: 4.19GB used: 0.63GB (15%) fs: swap dev: /dev/sda3
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 42.0C mobo: N/A

           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 254 Uptime: 1 day Memory: 1930.6/3846.2MB
           Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35 

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Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 8087:0a2a Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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