Fix Ubuntu 9.10 Brightness Problem on Lenovo Y450/G550

 

Ref: http://forum.ubuntu.org.cn/viewtopic.php?f=126&t=253303

I recently purchased a Lenovo IdeaPad Y450 Laptop, but the screen brightness was not being adjusted when I used the proper key combination (FN+UP/DOWN). The key combination did show the brightness bar, but did not adjust the actual brightness on the (LED) LCD. To fix this,

          sudo gedit /etc/default/grub

Change:

         GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

        GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"

Then run

        sudo update-grub

And restart!

 

---

 

For Lenovo G550 如上配置后，Brightness fucntion Key 不work，要如下改:

/etc/default/grub

#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor" 

#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

即使用第三种配置即可

注意：当升级 Ubuntu 到 10.04 LTS 时，需要用第二种配置

#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"