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Disclaimer First:

Now the Problem

I have installed Ubuntu 12.10 (64bit) in this Sony Vaio laptop. After vanilla isntallation the brightness keys are working and I can see the brightness indictaor going up and down but it isn't having any effect on the real brightness of the device.

I have installed additional drivers too but that didn't solve the problem. I can't seem to be able to change the brightness.

Anyone knows how I can fix this?

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This might help. I also had the same problem with my sony vaio. I found the solution here. askubuntu.com/questions/236616/… – imankurpatel000 Jan 26 at 15:33
@imankurpatel000 the link you provided just points me to another link where I have the same set of instructions(posted here) which doesn't help at all. – Rabimba Karanjai Jan 30 at 10:15
Sorry the link was wrong. Here is the original: askubuntu.com/questions/247145/… – imankurpatel000 Jan 31 at 15:47
I ahve tried that solution. Sadly it didn't work for me :( – Rabimba Karanjai Apr 29 at 8:15

1 Answer

up vote 0 down vote

Try modifying /etc/default/grub changing the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Then run sudo update-grub

If it doesn't work try changing the same line to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" and update-grub again.

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I tried doing both of them. And None of them worked. The only thing they did was to disable the brightness hotkeys in my keyboard. I've tried editing the [code]/etc/X11/xorg.conf[/code] file but in my case it's a blank file (I'm uisng ATI card) – Rabimba Karanjai Dec 21 '12 at 2:38
This might help. – To Do Dec 21 '12 at 8:16
Isn't that for FW series? – Rabimba Karanjai Apr 29 at 8:16

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