<div dir="ltr"><div><div>Dear Petter! </div>Thank you for reply. </div> Here is a list: <ul><li>in Arch backlight brightness load and save are provided by systemd (see <a href="https://wiki.archlinux.org/index.php/backlight#systemd-backlight_service" target="_blank">Arch wiki</a>), it is in <a href="https://www.archlinux.org/packages/core/x86_64/systemd/" target="_blank">systemd</a> package. </li><li>in OpenSUSE 13.1, OpenSUSE 13.2, CentOS 7, Fedora 20, Fedora 21, Mageia 4 - <a href="http://pkgs.org/search//usr/lib/systemd/systemd-backlight?type=files" target="_blank">systemd package</a></li><li>Sabayon has /usr/lib/systemd/systemd-backlight service</li><li>ALT Linux p7 has systemd, but does not have /usr/lib/systemd/systemd-backlight service</li><li>in Debian <a href="https://packages.debian.org/search?suite=jessie&arch=any&mode=path&searchon=contents&keywords=systemd-backlight">Jessie</a> and Debian <a href="https://packages.debian.org/search?suite=sid&arch=any&mode=path&searchon=contents&keywords=systemd-backlight">sid</a> there is /usr/lib/systemd/systemd-backlight service</li><li>in Ubuntu <a href="http://packages.ubuntu.com/search?searchon=contents&keywords=systemd-backlight&mode=filename&suite=utopic&arch=any" target="_blank">Utopic</a> and Ubuntu <a href="http://packages.ubuntu.com/search?searchon=contents&keywords=systemd-backlight&mode=filename&suite=vivid&arch=any" target="_blank">Vivid</a> there is /usr/lib/systemd/systemd-backlight service</li></ul>There is no backlight load/save functionality in (neither upstart nor systemd):<ul><li>Ubuntu Lucid</li><li>Ubuntu Precise</li><li>Ubuntu Trusty</li><li>Debian Wheezy</li><li>Debian Squeeze</li></ul> So it seems that modern distros have backlight load/save functionality via <a href="http://www.freedesktop.org/software/systemd/man/systemd-backlight@.service.html" target="_blank">systemd-backlight service</a>, but older systems does not have this functionality at all.For older (but supported) systems one can use my script with symlinks (may be with some files in /etc/pm/). I mean Debian 6, 7 and Ubuntu 12.04, 14.04. If you have any suggestions and recommendations - I'm ready to hear. What you and other developers think? With best regards, Norbert.P.S. I found interesting projects for the same purpose - first is named Light and hosted on <a href="https://github.com/haikarainen/light">GitHub</a> (previously known as <a href="http://haikarainen.dotgeek.org/lightscript/">LightScript</a>), second is named <a href="http://xyne.archlinux.ca/projects/relight/">Relight</a>. But I think that init-script approach is better. </div><div class="gmail_extra"> <div class="gmail_quote">On Tue, Dec 23, 2014 at 12:44 PM, Petter Reinholdtsen <<a href="mailto:pere@debian.org" target="_blank">pere@debian.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">[Nrbrtx] > I have tested many distros - Arch, OpenSuSe 13.1, Fedora 20, ALT Linux p7, > Sabayon, Mageia 4. > Many of them are based on systemd. > It does not matter what init system they use, but all of them have very > useful script (or binary program, I don't know) for saving and restoring > backlight level on laptop. > > In these distros there is a script for save and restore backlight levels > for two video-cards (acpi_video0 and acpi_video1). During system boot it is > indicated as follows: While this seem like a useful feature, it can only be implemented once it is decided which package should take resposibility for it. In which package is this handled byArch, OpenSuSe 13.1, Fedora 20, ALT Linux p7, Sabayon and Mageia 4? Can you check, as you haveaccess to these already? I do not. Knowing this might give an idea where to fix it in Debian and Ubuntu. :) I do not expect to have time to work on this myself any time soon, but hope someone will. :) -- Happy hacking Petter Reinholdtsen </blockquote></div> </div>