Ubuntu
acpi package

Brightness Problem

Asked by naveen

i installed ubuntu 12.04 , i cannot change the brightness.
my system is dell 1558.

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actionparsnip (andrew-woodhead666) said : 		#1

Try the boot option:

acpi_backlight=vendor

Source:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568611

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James Musser (jim4305) said : 		#2

Use the Dash Home on top left corner of screen, then type in Brightness on the top menu line... it will then show a Brightness and Lock screen that you can change to your preferences.

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naveen (naveenmvv) said : 		#3

acpi_backlight=vendor
this doesnt do any thing

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actionparsnip (andrew-woodhead666) said : 		#4

What did you do with the option I gave?

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naveen (naveenmvv) said : 		#5

i installed using wubi , cant find edit at boot time

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actionparsnip (andrew-woodhead666) said : 		#6

Then apply it in the desktop OS, or can you see nothing at all?

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naveen (naveenmvv) said : 		#7

i dont know how to apply in desktop os (win 7)

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actionparsnip (andrew-woodhead666) said : 		#8

Then how could yuo say:

"
acpi_backlight=vendor
this doesnt do any thing
"

?

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naveen (naveenmvv) said : 		#9

i thought at first it is a terminal command.

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actionparsnip (andrew-woodhead666) said : 		#10

It's a boot option, like I said.
https://help.ubuntu.com/community/BootOptions

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naveen (naveenmvv) said : 		#11

i cant find boot option at start up , mine is wubi 12.04 on win7.

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actionparsnip (andrew-woodhead666) said : 		#12

If you can boot to Ubuntu, you can apply the boot option within the OS itself.

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naveen (naveenmvv) said : 		#13

i don't know how to apply boot option in OS .

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actionparsnip (andrew-woodhead666) said : 		#14

Did you read the link I gave? Can you actually boot to the OS?

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