Bug 176485

Summary:	Screen brightness adjustment does not function
Product:	[Frameworks and Libraries] guidance-power-manager	Reporter:	Michal Klich <michal>
Component:	general	Assignee:	Jonathan Riddell <jr>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	ferriste, gonetil, jbastian, lamarque, rdieter, ssb
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed In:

Description Michal Klich 2008-11-29 21:25:31 UTC

Version:           guidance-power-manager-4.1.3-1.fc10.x86_64 (using KDE 4.1.3)
OS:                Linux
Installed from:    Fedora RPMs

Description of problem:
I am not able to adjust my screen brightness. I have configured brightness
levels for ac and battery but they do not seem to work. Though when i leave my
laptop and it turns off LCD as i have that in power management it changes
brightness to some low level and i am not able to change that back. It acts
really strange because it sometimes changes brightness with no reason.
My function keys to adjust brightness do not work either.


Version-Release number of selected component (if applicable):

kernel: 2.6.27.5-117.fc10.x86_64
xorg: xorg-x11-server-Xorg-1.5.3-5.fc10.x86_64 
guidance-power-manager: guidance-power-manager-4.1.3-1.fc10.x86_64

Laptop is Compaq 6720s, Intel X3100 graphic.

How reproducible:
Every time i use my laptop


Actual results:
Does not work

Expected results:
Should adjust brightness level

Comment 1 Jeffrey Bastian 2009-01-13 18:06:13 UTC

I have a similar problem with a Lenovo T60 laptop and Fedora 10 x86_64: the brightness keys (Fn+Home for brightness up, Fn+End for brightness down) do not work.

Using acpi_listen, I see these keys generate
   video LCD0 00000086 00000000
   video LCD0 00000087 00000000
for brightness up and down respectively.

And using xev, I see
   Fn+Home = keycode 233 = XF86MonBrightnessUp
   FN+End = keycode 232 = XF86MonBrightnessDown

Guidance Power Manager doesn't seem to know what to do with XF86MonBrightnessUp and XF86MonBrightnessDown keys, so I remapped them to F21 and F22 using xmodmap.
   xmodmap -e 'keycode 233 = F21'
   xmodmap -e 'keycode 232 = F22'

I then went to KDE4's System Settings -> Keyboard & Mouse -> Keyboard Shortcuts and under the "KDE Component: Guidance Power Manager" I changed Brightness Up to F21 and Brightness Down to F22.

Now I can change the brightness with Fn+Home and Fn+End.

Comment 2 Gonzalo 2009-03-05 11:38:46 UTC

Same happens in my Toshiba Laptop.

System won't apply brightness policy when reboot, although it does apply to CPU frequency.

When I open Guidance Power Manager main window, I can see the slider control to the minimum. If I even touch it, the system realizes that it must low down display brightness, and it applies my policy. Otherwise, I does nothing about it.

Some info. about my laptop:

Linux gonetil-laptop 2.6.27-13-generic
Video Intel 4500MHD
KDE 4.2.00

Toshiba Satellite A305-S6872

Comment 3 ssb 2010-12-16 23:40:44 UTC

Trivial patch submitted for 173146 which should help with saving brightness settings.  Doesn't do anything about function buttons for brightness.

Comment 4 Lamarque V. Souza 2011-02-05 00:48:34 UTC

*** Bug 247975 has been marked as a duplicate of this bug. ***

Comment 5 Lamarque V. Souza 2011-02-05 00:50:32 UTC


*** This bug has been marked as a duplicate of bug 173146 ***