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I use ubuntu 11.10 64bit on my Hp dv6 6080 laptop. i have problem in ubuntu 1) i can't adjust lcd brightness in ubuntu with brightness keys. how can i adjust lcd brightness because lcd brightness Offend my eyes. please help me

2)I can't switch to projector with switch button above buttons work on win7 but i can't use them on Ubuntu!

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closed as too localized by jrg Feb 27 '12 at 23:29

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No one can help me? –  Taher Nov 3 '11 at 14:07
    
This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :) –  Ringtail Feb 27 '12 at 23:17

5 Answers 5

That solution works for me too. I have Ubuntu 11.10 and Laptop HP PAVILION DV6

Too make things easier I created a script:

#!/bin/bash
brightness_file=/sys/class/backlight/intel_backlight/brightness
steep=500
current_brightness=`cat /sys/class/backlight/intel_backlight/brightness`
echo current_brightness = $current_brightness
new_brightness=$current_brightness

if [ "$1" = "+" ]
then
    new_brightness=`expr $current_brightness + $steep`
fi

if [ "$1" = "-" ]
then
    new_brightness=`expr $current_brightness - $steep`
fi

echo new_brightness = $new_brightness

echo $new_brightness | tee $brightness_file

One drawback here you have to open brightness_file for write to anyone: sudo chmod 666 brightness_file

Then put the script in a file. For example change_brightness.sh and you can change brightness with commands change_brightness.sh + or change_brightness.sh -

To make even better you can allocate shortcuts on the same f2 f3 keys.

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There's a stupid bug in Ubuntu 11.04 and later with NVidia chipsets, GPU's. For some GPU's, you can use the package smartdimmer.

sudo apt-get install smartdimmer 

After that smartdimmer -s <level>. Use the numbers 25-100.

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For the other question, the one with the display key, take a look at Disper:

http://www.ubuntuvibes.com/2011/06/disper-indicator-easily-clone-or-extend.html

It's quite an ugly solution, but it's the only one that worked for me in the past (though with a different laptop).

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Adding

acpi_backlight=vendor 

worked fine for me on Ubuntu 11.10 and HP Pavilion dv6.

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I'm using Arch Linux with KDE, but had the same problem (dv6 laptop as well, with hybrid Intel / ATI graphics).

I solved it by adding this to the kernel startup line in grub.cfg / grub.lst or whatever it' s called in Ubuntu:

acpi_backlight=vendor

Not sure if this works in Ubuntu though.

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