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I'm currently running ubuntu 11.10 on my Packard Bell tx86 when I try and use the fn key to change brightness, the icon thing appears in the top corner of the screen and the bar increases/decreases in size but nothing happens. The same happens when i try to change it in system preferences.

Anyone know how I could fix this?

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closed as off topic by fossfreedom Mar 4 '12 at 12:30

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question.

This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions here. –  fossfreedom Mar 4 '12 at 12:30

3 Answers 3

Enter to the terminal and do this:

sudo su
lspci|grep VGA

And now, remember the first numbers showed (i.e.: 00:02.0) Now enter this:

sudo setpci -s {A} F4.B={B}F

Where {A} are the first numbers showed and B a number between 0 (full brightness) and 7 (low brightess)

Sorry for my poor english, I'm japanese.

Greetings! ;)

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Exactly the same problem exists on the Dell XPS (NVIDIA GT555m). Here is a bugreport: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/762670

Check comment #15 for a working solution for this notebook. I see that the tx86 has a NVIDIA GPU too, so this should be worth checking out.

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i had the same problem before with my samsung n148, hope this will you coz it help me to.

How set brightness on startup

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before doing so try this first on your terminal "setpci -s 00:02.0 F4.B=50" without the quotes, once entered you will see the brightness, if it's not please disregard my previous post. thank you. –  dsaint Mar 4 '12 at 11:39

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