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Old 09-16-08, 09:38 PM   #1
dejuren
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Join Date: Sep 2008
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Default Backlight is not ajustable in Ubuntu 8.04 and 8.10 alpha

We are testing 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.
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Old 09-17-08, 01:47 AM   #2
ledoc
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Default Re: Backlight is not ajustable in Ubuntu 8.04 and 8.10 alpha

I think to have these interfaces you might also need modules specific to your laptop make and model. Like for example thinkpad_acpi for lenovo (there are similar ones for toshiba, asus,..). If the hardware is not too new, that should even be in the mainline kernel.

Do the backlight keys work when you switch to a console?
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Old 09-17-08, 05:11 PM   #3
dejuren
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Default Re: Backlight is not ajustable in Ubuntu 8.04 and 8.10 alpha

01:00.0 VGA compatible controller: nVidia Corporation Unknown device 06e9 (rev a1)

01:00.0 VGA compatible controller: nVidia Corporation Unknown device 060b (rev a2)

This is the info from lspci. It's not looking good for me (Unknown device). Will try with backlight button in console.
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