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The backlight of my Acer Aspire 5336 screen turns off when Ubuntu 12.04 is installed. I found that it could be corrected by editing the GRUB file Screen turns black after booting, backlight only works in recovery mode on an Acer Aspire 5736z

But since I cannot do so via Ubuntu (as the backlight is turned off) how can I edit the GRUB file?

Thank you

Community
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Sach
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2 Answers2

2

Why don't you try to edit the file using a external monitor?

Because if you can't edit the file and update Grub with the actual installation, you have to bind the installed OS using a LiveCD or LiveUSB (http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a-ubuntu-live-cd) and then edit the /etc/default/grub and update Grub.

Leo
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You could boot to a live CD and edit GRUB that way, or you can do it whilst in GRUB itself, much faster:

  • Highlight "Ubuntu" in the GRUB menu, but rather than hitting Return to boot Ubuntu, hit the letter e. This will take you to an editor.

If you never see a list of operating systems to boot, holding Shift as the computer loads will display it.

  • Add acpi_osi=Linux acpi_backlight=vendor at the end of the second-to-last line, as shown in the picture:

See the second-to-last line.

  • Hit F10, which will boot Ubuntu, backlight and all.

  • You can then make the change permanent by following the instructions in the answer you referred to.

Marcus
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