screen brightness adjustment keys incorrectly reset brightness to 100% after login

Bug #840707 reported by Rocko on 2011-09-04
This bug affects 10 people
Affects Status Importance Assigned to Milestone
gnome-settings-daemon (Ubuntu)

Bug Description

I have screen brightness set to about 30% in gnome-control-center's Screen app.

After I first login, the first time I press a brightness adjustment key, brightness is reset to 100%.

Subsequent adjustments work correctly. It appears that the adjustment script is not reading the correct setting the first time, but stores it for subsequent adjustment events.

Another behaviour probably related to this: if I say turn the brightness down to minimum and then switch to a guest session via the indicator-session menu, when I switch back the brightness is set to full. If I press either brightness adjustment key, it immediately resets the brightness back to minimum. So upower is using its locally stored setting, but it does not match the current setting.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: acpi-support 0.138
Uname: Linux 3.1.0-rc4-git-20110831.1150 x86_64
Architecture: amd64
Date: Sun Sep 4 08:40:38 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
SourcePackage: acpi-support
UpgradeStatus: Upgraded to oneiric on 2011-09-02 (1 days ago)

Rocko (rockorequin) wrote :
Steve Langasek (vorlon) wrote :

acpi-support does not handle screen brightness. Reassigning to upower.

affects: acpi-support (Ubuntu) → upower (Ubuntu)
Rocko (rockorequin) on 2011-09-05
description: updated
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in upower (Ubuntu):
status: New → Confirmed
Sebastian Senander (senanders) wrote :

Was this fixed? I have this problem with 12.04 too. Is there any working workaround?

luk1don (luk1don) wrote :

I dont know which package to choose but I confirm this bug.

I have to add this line (e.g.) to /etc/rc.local when I want to save brightness settings:
echo 2 > /sys/class/backlight/acpi_video0/brightness

affects: upower (Ubuntu) → gnome-settings-daemon (Ubuntu)
tomasi02 (tomas-ivanek) wrote :

is there any update about this problem?
I'm still experiencing this issue on laptop.

Linux dell-xps 3.12.0-031200-generic #201311031935 SMP Mon Nov 4 00:36:54 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise

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