I have installed windows 7 on my samsung laptop,but there is no effect of brightness when i press fn keys,brightness remains same.what can i do? i m very worried! please help me.
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This is a known bug on some laptops. Not sure if yours is one but you can change it from the command line see this question: How to change LCD brightness from command line (or via script)? – Warren Hill Sep 21 '13 at 09:45
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Is this question about ubuntu or windows? – damien Sep 21 '13 at 12:10
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Can you clarify the questions? If the problem in Windows 7 make sure you installed the correct driver. Also this website is intended for Ubuntu users lol – Hellnest Sep 21 '13 at 09:23
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Every thing is well but brightness remains same, no effect of increasing or decreasing. – Sohail Sep 21 '13 at 10:08
1 Answers
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Read this thread that I have posted Cannot change brightness setting using function buttons or using the brightness control bar on HP laptop
Here is the gist of it
Test- Restart your system, and when you get to the grub menu, select your distribution (Ubuntu 13.04), dont press enter, but press e (to edit).
This would bring up your menu entry for editing.
Append to the line with starts with linux (and looks like linux /boot/linux3.9. ............ (at the end of this line, leave a space and add) acpi_backlight=vendor
so that it will look like
linux /boot/vmlinuz-310-x86_64 root=UUID=3161dd63-38c0-44bc-bc1e-34b692209b0b ro acpi_backlight=vendor
After this press F10 to boot.
Now try changing the brightness. It works for me.
Now we have to make it permanent
To do that we need to edit the Grub configuration file-
In a terminal type
sudo gedit /etc/default/grub
This would open the Grub configuration file. In this file we have to edit the line
GRUB_CMDLINE_LINUX=""
to
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
After that save the file and run (type in the terminal)
sudo update-grub
to update the Grub configuration file.
