[FIXED] Brightness controls broken after hibernate/suspend

echo 0 > /sys/class/backlight/intel_backlight/brightness

works and reenables the backlight controls.

I'll work on a proof of concept work around for this.

There's probably a much, much better/elegant way to do this. But here is the dirty script I wrote to get things behaving nicely.

This is based on the information in the Gentoo wiki and the blog post.

Put this in a file located in /etc/pm/sleep.d/
ex: 10_intel_ brightness

#!/bin/bash
# Author xortim
# Description Workaround for intel backlight brightness quirk.

case "${1}" in
 resume|thaw)
 cat /tmp/pre_suspend_brt > /sys/class/backlight/intel_backlight/brightness
 ;;
 suspend|hibernate)
 cat /sys/class/backlight/intel_backlight/brightness > /tmp/pre_suspend_brt
 ;;
 *)
 exit 1
esac

Hope this helps someone else.

xortim, this has been fixed in the kernel. For future reference, it would have been very helpful if you posted a bug report on the project's Launchpad page (bugs.launchpad.net/dell-sputnik). Developers see those much faster than posts on this forum-- in fact, this specific bug was fixed BECAUSE someone reported it there :) .

Beacon11: can you point me to a bug/fix page on this issue? I searched the launchpad but could not find anything. I am trying to figure out which kernel version has this fix you mention.

Ooo, yeah-- that's where all the Sputnik-specific stuff is! I bet you'll notice several other improvements as well (especially the touchpad)! For future reference, Sputnik has a distro pre-seeded with all the necessary PPAs etc. here: hwe.ubuntu.com/.../dellxps . I recommend you install that from now on.

Thank you Beacon11. I now understand that I should have added the two PPAs (sputnik-policykit and sputnik-kernel). I did that and now the brightness is fine when coming back from sleep.