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Low brightness when installing Fedora 18.

asked 2013-04-05 08:22:57 -0500

Andreidabal gravatar image

updated 2014-09-28 15:49:22 -0500

mether gravatar image

I have an acer emachines e725, and I try to install Fedora 18 from usb.Problem is that brightness is very low, and when I try to install Fedora ( I mean, I press "Start Fedora 18 installation ), even with low brightness I see a console, where I can write. If I start basic graphic installation I got I guess the same console where I can see an error message ( some kind of /dev.... is missing ). What can I do?

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Peter Scott gravatar imagePeter Scott ( 2013-04-05 11:02:23 -0500 )edit

What tool did you use to create the usb boot media?

yanglifu90 gravatar imageyanglifu90 ( 2013-04-06 06:20:10 -0500 )edit

I used live usb creator. I'll check that link.

Andreidabal gravatar imageAndreidabal ( 2013-04-07 07:27:17 -0500 )edit

It might be worth trying to add this to the kernel boot options (by pressing [tab] at the boot menu): acpi_backlight=vendor

jamielinux gravatar imagejamielinux ( 2013-08-28 09:12:09 -0500 )edit

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answered 2013-06-02 16:24:51 -0500

tz gravatar image

there is /sys/class/backlight which will have directories for backlight hardware. In them will be a "brightness" and "max_brightness" entries.

echo (whatever was in max_brightness) >brightness will go to the top, but for example if max is 10, echoing 5 > brightness will be half brightness, if max is 250, echoing 125 will be half brightness.

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Asked: 2013-04-05 08:22:57 -0500

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Last updated: Aug 28 '13