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i did search in google but haven't find anything about this problem for my model laptop: Packard Bell TS11HR-068GE the graphic card is: NVIDIA GeForce 610M

i am newbie on linux & ubuntu, so pls tell me as simply as possible how can i fix this problem


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You can add to grub config an acpi command.

Issue following command to edit /etc/default/grub,

sudo gedit /etc/default/grub

modify the following lines adding "acpi_backlight=vendor" like below

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

then run

 sudo update-grub

After that restart your system.

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THIS HAS HELPED, thank you!!! – zunzum Jun 11 '12 at 12:12

Same solution as one-liner

For this solution no nano knowledge is required. It is also handy for multi-machine installation scripts.

sudo sed -i 's|^GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"|GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"|' /etc/default/grub && sudo update-grub
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