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Old 12-18-2009, 01:15 AM   #1
jmbreija
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I installed centOS but the backlight on the monitor doesn't work


I just did a fresh install of the latest centOS today. When I startx the GNOME desktop, my screen goes black. After I looked very very closely, I noticed I was actually in the desktop but with no brightness or light. I have to use a flashlight to view my screen or else I can't see anything.

Any thoughts as to how I can fix this?

Last edited by jmbreija; 12-18-2009 at 01:19 AM.
 
Old 12-18-2009, 02:44 AM   #2
Kenichi Kato
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Hi,

Could you "cat /etc/X11/xorg.conf"? I'm using CentOS 5.4 for my office servers.
 
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Old 12-18-2009, 08:17 PM   #3
jmbreija
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Quote:
Originally Posted by Kenichi Kato View Post
Hi,

Could you "cat /etc/X11/xorg.conf"? I'm using CentOS 5.4 for my office servers.
Hi,

Sorry for the late response. My xorg.conf is below

Quote:
# Xorg configuration created by pyxf86config

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Synaptics" "CorePointer"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Synaptics"
Driver "synaptics"
Option "Device" "/dev/input/mice"
Option "Protocol" "auto-dev"
Option "Emulate3Buttons" "yes"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "intel"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
I have an integrated intel graphics card so everything appears to be right except for maybe the "Screen" section.
 
Old 12-18-2009, 08:50 PM   #4
Kenichi Kato
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Yeah, it seems so. Now, under Section "Screen", try adding the following line after Device "Videocard0":

Monitor "Monitor0"
 
Old 12-18-2009, 09:25 PM   #5
jmbreija
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Quote:
Originally Posted by Kenichi Kato View Post
Yeah, it seems so. Now, under Section "Screen", try adding the following line after Device "Videocard0":

Monitor "Monitor0"
I tried but then startx fails and GNOME gives an error saying screen is trying to reference Monitor0.

Apparently GNOME has a brightness applet but I can't find it so I'm not sure if everything there is correct. I also read about a file called xBrightness but I have no such file under /etc/x11
 
Old 12-18-2009, 10:54 PM   #6
rkski
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Quote:
I tried but then startx fails and GNOME gives an error saying screen is trying to reference Monitor0.
That's because you're missing a "Section Monitor" in your xorg.conf. What kind of monitor are you using?

This is what I have in mine:

Quote:
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 80.0
VertRefresh 43.0 - 60.0
Option "DPMS"
EndSection
HTH
 
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Old 12-18-2009, 11:01 PM   #7
jmbreija
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Quote:
Originally Posted by rkski View Post
That's because you're missing a "Section Monitor" in your xorg.conf. What kind of monitor are you using?

This is what I have in mine:



HTH
I'm using a nv78 Gateway laptop.
 
Old 12-18-2009, 11:51 PM   #8
rkski
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The config I posted is on a laptop so it should work for you. Try adding it to your xorg.conf and rebooting.
Dont' forget to add 'Monitor "Monitor0"' in the 'screen' section.
 
  


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