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rated 0 times [ 1] [ 0] / answers: 1 / hits: 3832 / 3 Years ago, sat, may 8, 2021, 10:59:48

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

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3 Years ago

answered 3 Years ago heaco · Accepted Answer

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.

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