Ubuntu

How to save brightness setting on Ubuntu 12.10 on Samsung

Asked by Pablo

I would like to save the brightness setting on my Samsung with Ubuntu 12.10. As it is, I have to adjust it (downward) every time I start up. I tried the following but it didn't work.
Open a terminal (Ctrl + Alt + T).
– Then type sudo nano /etc/default/grub. It will ask for your password. Type it in.
– Around the 11th line, there will be something like: GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”.
change it to GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor”
– Save the file by Ctrl+O followed by Ctrl+X. Then run sudo update-grub in the terminal.
– Reboot and see if backlight adjustment works.

Thank you for your help.

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actionparsnip
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actionparsnip (andrew-woodhead666) said : 		#1

What is the output of :

sudo dmidecode -t 1; lsb_release -a; uname -a

Thanks

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Pablo (ceascolombia) said : 		#2

# dmidecode 2.11
SMBIOS 2.7 present.

Handle 0x0001, DMI type 1, 27 bytes
System Information
 Manufacturer: SAMSUNG ELECTRONICS CO., LTD.
 Product Name: 530U3C/530U4C
 Version: 0.1
 Serial Number: HTUS91DC500150
 UUID: 271D6440-1DD2-11B2-8000-FCEEBD098DF7
 Wake-up Type: Power Switch
 SKU Number: System SKUNumber
 Family: ChiefRiver System

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.10
Release: 12.10
Codename: quantal
Linux ceas-530U3C-530U4C 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:15:40 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

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actionparsnip (andrew-woodhead666) said : 		#3

Do you dual boot the system?

Thanks

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Pablo (ceascolombia) said : 		#4

Yes, I dual boot. Windows 8 is also installed

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actionparsnip (andrew-woodhead666) said : 		#5

Have you tried updating your BIOS?

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Pablo (ceascolombia) said : 		#6

No I haven't udated the BIOS. I fear that I will need your orientation on how to do that. Would you? Thanks

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actionparsnip (andrew-woodhead666) said : 		#7

There will be an application to do it in Windows.

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Pablo (ceascolombia) said : 		#8

I have updated the BIOS, but the brightness setting adjustment still does not hold on restart. It goes back to maximum brightness.

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Best actionparsnip (andrew-woodhead666) said : 		#9

sudo apt-get install xbacklight

you can now run:

xbacklight -set 50

To test, if it runs ok, you can add a startup item to run the command

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Pablo (ceascolombia) said : 		#10

when I run xbacklight -set 50 or put 10 or 5, it lowers the brightness, but when I reboot, it goes back to maximum brightness..

Just to check if I did it right, after running sudo apt-get install xbacklight I simply pasted xbacklight -set 50 and hit <enter>

Thank you for your ongoing help with finding a solution

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actionparsnip (andrew-woodhead666) said : 		#11

"if it runs ok, you can add a startup item to run the command"

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Pablo (ceascolombia) said : 		#12

Sorry, I didn't catch that.

My ignorance. How do I "add a startup item to run the command"?

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actionparsnip (andrew-woodhead666) said : 		#13

Search the Dash for the word: startup you will get an app which you can add any command to run after you login.

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Pablo (ceascolombia) said : 		#14

Thank you very much. Problem solved. What you have proposed is a simple and elegant solution. Before recurring to Launchpad, I had checked out recommendations vía Google--with a variety of reponses, none as simple and effective as this.

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Pablo (ceascolombia) said : 		#15

Thanks actionparsnip, that solved my question.