Ubuntu on MacBook 4,1 (2008) Backlight Screen Issue Post: 302953374

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Operating Systems Linux Ubuntu Ubuntu on MacBook 4,1 (2008) Backlight Screen Issue Post 302953374 by Corona688 on Thursday 27th of August 2015 12:24:41 PM

08-27-2015

Registered User

Explore under /sys/class/backlight or /proc/acpi/video for an ACPI interface for your video card perhaps, sometimes there's a control for backlight power there which might have chosen a stupid value as its default.

Make sure you have the relevant modules modprobed to get those interfaces.

It might be useful to set up sshd, so you can login via something else until you can see your screen properly. An external monitor could also help.

See here: https://bbs.archlinux.org/viewtopic.php?id=113476

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LEARN ABOUT LINUX

xbacklight

XBACKLIGHT(1)						      General Commands Manual						     XBACKLIGHT(1)

NAME

       xbacklight - adjust backlight brightness using RandR extension

SYNOPSIS

       xbacklight [-help]  [-display display] [-get] [-set percent] [-inc percent] [-dec percent]

DESCRIPTION

       Xbacklight is used to adjust the backlight brightness where supported. It finds all outputs on the X server supporting backlight brightness
       control and changes them all in the same way.

       -get   Print out the current backlight brightness of each output with such a control. The brightness is represented as a percentage of  the
	      maximum brightness supported.

       -set percent
	      Sets each backlight brightness to the specified level.

       -inc percent
	      Increases brightness by the specified amount.

       -dec percent
	      Decreases brightness by the specified amount.

       -help  Print out a summary of the usage and exit.

       -time milliseconds
	      Length of time to spend fading the backlight between old and new value.  Default is 200.

       -steps number
	      Number of steps to take while fading. Default is 20.

SEE ALSO

       Xrandr(3)

AUTHORS

       Keith Packard, Open Source Technology Center, Intel Corporation.

X Version 11							 xbacklight 1.1.2						     XBACKLIGHT(1)