Ubuntu
gnome-power-manager package

"Display brightness" slider does not show up on Dell Latitude D810

Bug #116464 reported by René Brandenburger
8
Affects Status Importance Assigned to Milestone
gnome-power-manager (Ubuntu)
Invalid
Low
Unassigned

Bug Description

On my Dell Latitude D810, the brightness slider does not show up in the settings dialog on the Battery Tab. The Brightness Applet doesn't work either.
Setting the Brightness using the FN keys on the keyboard works fine.

Using Feisty with latest updates applied.

Tags: laptop
Revision history for this message
Pedro Villavicencio (pedro) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. Are you still facing this problem?, have you tried to reproduce this with gutsy?

Changed in gnome-power-manager:
assignee: nobody → desktop-bugs
importance: Undecided → Low
status: New → Incomplete
Revision history for this message
René Brandenburger (rene-brandenburger) wrote :

the problem is still present as of aug. 8th, all updates applied. Unfortunately i don't have a chance to try out gutsy at the moment. sorry for that.

Revision history for this message
Shadows_Friend (shadows-friend) wrote :

I have exactly the same issue on my Acer Travelmate C202TMi. I can control the brightness via the hotkeys. But neither the slider in the gnome-power-manager (In fact the slider is not there) nor the brightness applet work. I'm running on the latest Gutsy with all available updates.

Pedro Villavicencio (pedro)
Changed in gnome-power-manager:
status: Incomplete → New
Revision history for this message
Shadows_Friend (shadows-friend) wrote :

I think my problem is located in the fact that there I have no real ACPI-support for my Acer-model. The brightness control via the hotkeys seems to be done by the BIOS not by any ACPI-event. Even the available "acer-acpi" module doesn't support my Travelmate C200 series notebook. I hardly have access to ACPI-functions via the proc filesystem. I only get following answers if i try to access any of the ACPI-stuff:

#cat ./acpi/video/VGA/LCD/brightness
<not supported>

So it can be concluded that it is an issue of ACPI-support. Maybe the other people affected can confirm this?

Revision history for this message
Sune Keller (sune-keller) wrote :

I can confirm this on a ThinkPad X32.
Running gutsy with all updates,

uname -a

prints "Linux skx 2.6.22-14-generic #1 SMP Sun Oct 14 23:05:12 GMT 2007 i686 GNU/Linux".

If I do

# cat /proc/acpi/video/VID/LCD0/brightness

I get "<not supported>" like Shadows_Friend, but

# cat /proc/acpi/ibm/brightness

I get
"level: 7
commands: up, down
commands: level <level> (<level> is 0-7)".

Also, the gnome-power-manager Preferences dialogue doesn't display the brightness slider like it used to do.

Revision history for this message
January (january-weiner) wrote :

Confirmed on Thinkpad X40.

Furthermore, issuing

echo up > /proc/acpi/ibm/brightness

doesn't do anything (like it used to)

Revision history for this message
Michael Losonsky (michl) wrote :

On a Dell C610 running Hardy Alpha5 the dimmer works on AC,
but not on battery. I assume that's how it's designed.

On AC it indicates that it dims from 100% to 0%, but this is
not quite right. The lowest setting (0%) does not blank the
screen, but puts it at where the screen is on battery power.

Revision history for this message
Sebastien Bacher (seb128) wrote :

Closing the bug, the slider has been removed from the dialog in the new version

Changed in gnome-power-manager:
assignee: desktop-bugs → nobody
status: New → Invalid
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