Power management: Difference between revisions

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== Gnome ==
See
* Power (or Brightness and Lock) settings
* <code>dconf-editor</code>, path <code>/org/gnome/desktop/screensaver</code>.

== Systemd ==
== Systemd ==
See [[Systemd]] (<code>systemd-inhibit</code>).
See [[Systemd]] (<code>systemd-inhibit</code>).

Latest revision as of 06:49, 27 March 2019

Gnome

See

  • Power (or Brightness and Lock) settings
  • dconf-editor, path /org/gnome/desktop/screensaver.

Systemd

See Systemd (systemd-inhibit).

X11 screensaver

See X11 (screensaver).

Brightness / Backlight

Various way to control laptop screen brightness

  • In Ubuntu, open the Brightness & Lock settings applet.
  • Use the keyboard Fn keys Fn+Brightness up/down
  • Via command-line by editing /sys/class/backlight/intel_backlight (from bug 847001):
cat /sys/class/backlight/intel_backlight/max_brightness
# 976
cat /sys/class/backlight/intel_backlight/brightness
# 123
echo 600 | sudo tee /sys/class/backlight/intel_backlight/brightness
# 600
echo 200 | sudo tee /sys/class/backlight/intel_backlight/brightness
# 200
For ease, use the following script
Add to /etc/sudoers:
joesmith    ALL = NOPASSWD: /usr/bin/tee /sys/class/backlight/intel_backlight/brightness
  • Using xbacklight
xbacklight -set 100
sudo setpci -s 00:02.1 f4.b=77     # where 77 (00-ff) is the brightness value
$ ls /sys/class/backlight/
intel_backlight@
Create a file /usr/share/X11/xorg.conf.d/20-intel.conf with content as shown below, then log off and log back in.
Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"

EndSection
On some model (e.g. Dell latitude E5430), vendor acpi must be enabled in grub. Edit /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Then update grub and reboot:
sudo update-grub