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The low brightness problem in Linux has been posted before in a couple of threads along with the fix, but I thought I’d do a quick write up on it anyway.
Stage 1: BIOS
The first thing you need to do is to go into the BIOS by pressing F2 when the computer starts, and change the “Brightness Mode Control” from “Auto” to “User Control”. Once you have changed the setting press F10 to save the changes and exit from the BIOS
“The Brightness values could be remained regardless of the status of AC adapter” sounds a little Engrish to me.Stage 2: Upping The Brightness
The next thing you need to do is to max out the brightness while the computer is starting up.So while on the GRUB screen (or other part of the boot sequence) press Fn + UP until the brightness won’t go any higher.
You should now have the full range of brightness in Linux.
However you will most likely need to repeat this stage after each time you boot Windows.
Stage 3: Easy Brightness Control For Gnome
There are a few ways of getting the brightness controls to work if the brightness keys don’t work in your distribution. I choose the easy way until a fix is made available.Right Click on a panel and Choose “Add to Panel”.
Click on “Brightness Applet” and click “Add”.You can now click on the Brightness Applet and use the slider to control the brightness.
Stage 4: Some Other Possibly Useful Gnome Settings
Here are a couple of suggestions on settings up the backlight in Gnome.Right Click on the Power Management Applet (the battery/plug icon) and choose “Preferences”.
On the “On AC Power” tab, I made sure “Dim display when idle” is unticked and set the “Set display brightness to:” slider to 50%.
On the “On Battery Power” tab, I made sure “Dim display when idle” and “Reduce backlight brightness” is checked.
Extras
OpenSUSE (Gnome), Fedora 10 (after updating), Ubuntu 9.04 and most other recent distributions have working brightness controls now. Fedora 11 currently cannot control the brightness
The problem of the brightness controls sticking and blocking the keyboard has been reported and a fix has suposedly been merged into the 2.6.29-rc3 Kernel (a patch is also available), see the bug report here:-
Kernel Bug Tracker Bug 12021There is another bug which affects gnome-power-management, which disables the brightness keys if you set the brightness to 0, this has been fixed. See the bug report here:-
Gnome Bugzilla Bug 569100Just wanted to say thanks Alfihar. I had been wondering how to solve this issue for a while. Any other handy nc10 linux tips you care to write up would be very much appreciated.
Keep up the good work!
Excellent post. Your summary is very clear and concise and saves some frustration when one can’t find this info scattered across other threads. This came in handy last night, after I unpacked the NC10 and installed Linux. Thanks for this.
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