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The fact that this is only happening occasionally is a HUGE problem. This could be anything from hardware (unlikely) to driver (probably more likely) to system or kernel error (more likely.) Try a Live USB of a later OS (14.04+) and see if the problem persists. Please send a screenshot of the result.


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FYI, just worked through this on a Lenovo W520, and the addition of the simple line Option "RegistryDwords" "EnableBrightnessControl=1" to xorg.conf was enough - no need for any of the other bogosity, and all works fine with a current NVidia release (specifically, running 346.35)


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Check /etc/acpi/events/ and you should find some files named something like asus-keyboard-backlight-down and -up, along with several other events. Don't edit those, but take a look at the shell scripts in /etc/acpi/. Mine, /etc/acpi/events/asus-keyboard-backlight.sh looks like this: (The comments are part of the script, NOT mine) #!/bin/sh # this ...


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I just found https://www.opengl.org/discussion_boards/showthread.php/157014-Compiling-with-gcc, and I modified the code to get rid of the 100% CPU hog; it seems to work fine on Ubuntu 14.04 - simply run it from a terminal, draw your rectangle area, and the program will exit, printing the coordinates in the terminal: xrectsel.c: #include<stdio.h> ...


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Under System Settings, go to Power. From there you can untick 'Dim screen to save power'. This will prevent your screen from dimming when you're not using it.


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This does not make your brightness function keys work, but is a workround. Install Brightness Controller with the following commands: sudo add-apt-repository ppa:apandada1/brightness-controller sudo apt-get update sudo apt-get install brightness-controller You can control brightness using its slider.


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So this worked for me: sudo -i cd /etc/X11 touch xorg.conf nano xorg.conf then in the simple nano editor, write (or just paste) this: Section "Device" Identifier "Configured Video Device" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" ...


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Personally, I use terminal commands xgamma for contrast and occasionally xrandr for brightness (though mostly I use the native brightness setting - more on that later ). To change contrast with xgamma , do xgamma -gamma $1 Where $1 is a decimal value. It can be 1.5 or .5 , but the values above those values can be harsh on the eyes, so play with the ...


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Try Ctrl+alt+f7 and see if it drops you into a command line. log in and run. "sudo apt-get update" then "sudo init 6" and "sudo apt-get upgrade". if that doesn't work it appears that if you re-install ubuntu it is very un-likely that you'll do the exact same thing that caused the error in the first place.


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Ny problem is that I am using Ubuntu 15.10 with gnome-session-flashback installed and using the Metacity interface. This is one of the few things not shown in the Menus. I need to add it to the menu or know how to do it from the command line. Use to have this stuff as well under 14.04 LTS. Can you help me? By the way, Main Menu will let you change what ...



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