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My display brightness adjustment is off by a factor of 10, i.e. it's brightest at 10% instead of at 100%, and the difference between 0% and 1% is a little too high.

Any way to fix either of these problems? (VAIO CW laptop)

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You should report this as a bug, not sure about the package though. –  Lekensteyn Jul 30 '11 at 8:24
    
@Lekensteyn: For some reason, I just don't yet feel very comfortable creating an account on Launchpad (and related) sites. I was supposed to report something else as well, but I don't think I'm going to, unfortunately. :\ –  Mehrdad Jul 30 '11 at 8:28
    
A LP account can be used for multiple services related to Ubuntu: Launchpad (bugs, code, answers) and Ubuntu Wiki. If you sign up, you'll have to provide an e-mailaddress to which a confirmation mail is sent. See also help.launchpad.net/YourAccount/NewAccount –  Lekensteyn Jul 30 '11 at 8:32
    
As for the original question, does it happen with your keyboard shortcut or an applet? If you run cat /sys/class/backlight/acpi_video0/max_brightness | sudo tee /sys/class/backlight/acpi_video0/brightness, is your brightness set to 100%? –  Lekensteyn Jul 30 '11 at 8:33
    
@Lekensteyn: acpi_video0 doesn't even exist. (I have an NVIDIA card.) –  Mehrdad Jul 30 '11 at 18:01

2 Answers 2

From the information you've given us, it appears that you need to change your GRUB settings.

To do that, open up a terminal and run the following commands:

gksu gedit /etc/default/grub - what that command will do is open Gedit in "Sudo Mode" and have the GRUB configuration file open.

Then, change GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

Then, run sudo update-grub and reboot. Brightness problem should be solved.

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I had high hopes for this, but it didn't seem to work. :( –  Mehrdad Aug 9 '11 at 3:58

I have the same laptop and have the same problem. What i have found is that if you go in to gnome configuration editor (gconf-editor) there you navigate to apps, gnome-power-manager, backlight. If i change the key brightness_ac from values 0-12 it affects my screen brightness. However values over 12 up to 100 doesn't make any difference to the brightness compared to 12. When i use the fn+ f5, f6 keys it seams to adjust the brightness in values from 0-100 with increments of 5. I hope this make sense for someone with more knowledge in ubuntu then me

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