Laptop backlight adjustment problem

[Francisco Maia]

Hello there,

I have a HP Pavilion DV2385EA with a Nvidia Go 7200.

When using the nvidia driver, the brightness applet appears disabled which is fair enough (I assume the support is not available in this driver?), but it does nothing apparent. There is no flickering or display adjustment, neither any error message displayed.

FWIW, the smartdimmer program is not able to adjust the brightness. Also the brightness adjustment keys on the laptop do nothing (Fn+F7,F8).

I'm running up to date Feisty (kernel is currently 2.6.20-14-generic)

Thanks a lot,
Francisco Maia

[cbord11 (cbord11)]

Other users have encountered this bug, after bringing the BIOS to the most recent version, and there is a work-around, but it didn't work for me. http://ubuntuforums.org/showthread.php?t=500516&highlight=dv2000+brightness

[Francisco Maia (amaia)]

Thanks a lot.
Gonna give a try ASAP.

Francisco Maia

[Basilio Kublik (sourcercito)]

Hi there
Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you?, Can you try with the live environment of the Desktop CD of the development release - Hardy Heron?

 Thanks in advance.

[Francisco Maia (amaia)]

Hey,

    Still not working on my currently installed system - Ubuntu 7.10 Gutsy.
    I can't try a live CD for the time, sorry! :-(

Best regards,
Francisco Maia

Basilio Kublik wrote:
> Hi there
> Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you?, Can you try with the live environment of the Desktop CD of the development release - Hardy Heron?
>
> Thanks in advance.
>
> ** Changed in: gnome-power-manager (Ubuntu)
> Importance: Undecided => Low
> Assignee: (unassigned) => Basilio Kublik (sourcercito)
> Status: New => Incomplete
>
>

[Oguz Yarimtepe (oguzy)]

I have a smilar problem.

I am using Hardy Heron and my graphic card is GeForce 9600M GT series. So i am using the latest hardy-propesed package for the nvidia driver.

I am only able to set the brightness via nvidia-settings. Power Manager Brightness Applet 2.22.1 is not dimming the backlight. Same, no error, no flickering. Nothing happens.

I posted to ubuntuforums a help request, may help you for some further info: http://ubuntuforums.org/showthread.php?t=863975

[Dragomir Minkovski (dejuren)]

Similar problem here - two high end notebooks with nVidia 9800M GT cards. Brightness hot keys don't work and possible brightness levels are not available on either system.

ls /proc/acpi/video/

--- directory is empty

ls /sys/class/backlight/

--- directory is empty

Brightness can be adjusted in the BIOS and Windows on one system and only in Windows on the second.

Tested 8.04.1 with the latest kernel and Intrepid with 2.6.27-2 and 2.6.27-3.

acpi will dim the display to sleep when inactive.

With nvidia-settings color brightness can be adjusted but not the backlight.

The brightness can not be adjusted in kpowersave either. It says the "Your hardware currently does not support changing the brightness on your display". This is the same as gnome brightness panel applet. I think it's due to the inability to read LCD brightness data from /proc and /sys interfaces.

[Alberto Milone (albertomilone)]

Can you report the problem to NVIDIA, please?
http://www.nvnews.net/vbulletin/showthread.php?t=117209&page=2

They should know if there's a (different?) way to dim the backlight.

[Alberto Milone (albertomilone)]

Sorry, I meant this address:
http://www.nvnews.net/vbulletin/forumdisplay.php?f=14

[Dragomir Minkovski (dejuren)]

Tks Aberto, the problem was reported.

[Pedro Villavicencio (pedro)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Could you try to reproduce the same with Ubuntu 9.04? Thanks in advance.

[Francisco Maia (amaia)]

Not using this laptop anymore, sorry...

On Apr 29, 2009, at 3:22 PM, Pedro Villavicencio wrote:

> Thank you for taking the time to report this bug and helping to make
> Ubuntu better. You reported this bug a while ago and there hasn't been
> any activity in it recently. We were wondering is this still an issue
> for you? Could you try to reproduce the same with Ubuntu 9.04?
> Thanks in
> advance.
>
> ** Changed in: gnome-power-manager (Ubuntu)
> Status: New => Incomplete
>
> --
> Laptop backlight adjustment problem
> https://bugs.launchpad.net/bugs/112054
> You received this bug notification because you are a direct subscriber
> of the bug.

[Victor Vargas (kamus)]

According last message information needed is not able to be published, so for now I will close this report but if you encounter that this issue is still affecting you please reopened. Thanks!