dimmed laptop screen

[El_FLuffo]

I was messing around this weekend trying to get Beryl working with debian etch on an acer aspire 1640. I blindly followed some online instructions, as I know next to nothing about X11. The problem is that now, when I boot up the machine, the screen is dimmed, as if I were running on battery power. Here's the output of /etc/X11/xorg.conf. Can anyone say where I've gone wrong and what the solution is?

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
	FontPath	"/usr/share/fonts/X11/misc"
	FontPath	"/usr/X11R6/lib/X11/fonts/misc"
	FontPath	"/usr/share/fonts/X11/cyrillic"
	FontPath	"/usr/X11R6/lib/X11/fonts/cyrillic"
	FontPath	"/usr/share/fonts/X11/100dpi/:unscaled"
	FontPath	"/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
	FontPath	"/usr/share/fonts/X11/75dpi/:unscaled"
	FontPath	"/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
	FontPath	"/usr/share/fonts/X11/Type1"
	FontPath	"/usr/X11R6/lib/X11/fonts/Type1"
	FontPath	"/usr/share/fonts/X11/100dpi"
	FontPath	"/usr/X11R6/lib/X11/fonts/100dpi"
	FontPath	"/usr/share/fonts/X11/75dpi"
	FontPath	"/usr/X11R6/lib/X11/fonts/75dpi"
	# path to defoma fonts
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
	Load	"i2c"
	Load	"bitmap"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"vbe"
	Load    "dbe"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"es"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
EndSection

Section "Device"
	Identifier	"Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller"
	Driver		"i810"
	BusID		"PCI:0:2:0"
	Option 		"AddARGBGLXVisuals"
	Option 		"RenderAccel" "true"
	Option 		"AllowGLXWithComposite" "true"
EndSection

Section "Monitor"
	Identifier	"Generic Monitor"
	Option		"DPMS"
	HorizSync	28-51
	VertRefresh	43-60
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller"
	Monitor		"Generic Monitor"
	DefaultDepth	24
	Option 		"XAANoOffscreenPixmaps"
	Option 		"AddARGBGLXVisuals" 	"On"
	SubSection "Display"
		Depth		1
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1024x768"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1024x768"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	Option 		"AIGLX" 	"on"
EndSection

Section "DRI"
	Mode	0666
EndSection

Section "Extensions"
   	Option 	"Composite" 	"Enable"
EndSection 

Section 	"Extensions"
Option 		"Composite" 	"Enable"
EndSection 

############################################

Thanx in advance

[TheBigPhish]

can you manually make the screen brighter with the Fn + (whatever) keys on the keyboard?

[El_FLuffo]

ooh - hadn't thought of that! Fn plus what exactly? I'm googling right now but haven't found the answer yet.
Thanx for your answer

[El_FLuffo]

two minutes later - Fn + left or right arrow on an Acer Aspire.
Thanks a lot for your help BigPhish

[bigtomrodney]

One of your number keys or your cursors should have symbols looking like a sun with +/- signs beside them. Functions are usually in blue rather than the white font you normally see.

I notice you have the composite extension in your xorg.conf twice. It may be doing no harm but I would remove one of them anyway.

[El_FLuffo]

Thanks for that bigtomrodney - I hadn't noticed!