How to disable internal LCD in a static configuration on a DELL Latitude 601

[Juergen Beisert]

Hi,

I'm using my DELL Latitude 601 Laptop most of the time in its docking station. 
Connected is an external DVI LCD Monitor, nothing connected to the analog VGA 
or TV output. The laptop comes with a 915GM chipset. I'm running 
xf86-video-intel-2.9.1/xorg-server-1.7.1/Linux-2.6.34 on this laptop (on a 
Linux from scratch system). The LID is always closed but the laptop's 
internal LCD is always on. After each X server's start if have to disable the 
LCD with the command "xrandr --output LVDS1 --off" manually (at least LCD's 
backlight will be switched off), otherwise the laptop is going to be very 
hot. I have to reenter this command whenever I switch to the console and back 
to the graphic.

I tried various settings in the 'xorg.conf' to only enable the external DVI, 
but without success, yet.

Is there any way to define an 'xorg.conf' setting to only enable the external 
DVI statically (for example the VGA1 is disabled. Still no video output at 
this connector, even if I connect a monitor to it (my DVI LCD also has a 
analog VGA input). In this case the video driver detects the monitor but do 
not enable the output)?

Here some video driver relevant log:

[...]
(II) Primary Device is: PCI 00 at 00:02:0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 11, (OK)
drmOpenByBusid: Searching for BusID pci:0000:00:02.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 11, (OK)
drmOpenByBusid: drmOpenMinor returns 11
drmOpenByBusid: drmGetBusid reports pci:0000:00:02.0
(==) intel(0): Depth 24, (--) framebuffer bpp 32
(==) intel(0): RGB weight 888
(==) intel(0): Default visual is TrueColor
(**) intel(0): Option "DRI" "true"
(**) intel(0): Option "ModeDebug" "true"
(II) intel(0): Integrated Graphics Chipset: Intel(R) 915GM
(--) intel(0): Chipset: "915GM"
(II) intel(0): Output VGA1 using monitor section External VGA Monitor
(**) intel(0): Option "Enable" "False"
(II) intel(0): Output LVDS1 using monitor section Internal Panel
(**) intel(0): Option "Enable" "false"
(II) intel(0): Output DVI1 using monitor section HomeMonitor
(**) intel(0): Option "Enable" "true"
(II) intel(0): Output TV1 using monitor section External TV
(**) intel(0): Option "Enable" "False"
(**) intel(0): Option "ModeDebug" "true"
(II) intel(0): EDID for output VGA1
[...] listed modes skipped [...]
(II) intel(0): EDID for output LVDS1
(II) intel(0): Manufacturer: SEC  Model: 3450  Serial#: 0
(II) intel(0): Year: 2004  Week: 0
(II) intel(0): EDID Version: 1.3
(II) intel(0): Digital Display Input
(II) intel(0): Max Image Size [cm]: horiz.: 29  vert.: 21
(II) intel(0): Gamma: 2.20
(II) intel(0): No DPMS capabilities specified
(II) intel(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4
(II) intel(0): First detailed timing is preferred mode
(II) intel(0): redX: 0.595 redY: 0.340   greenX: 0.320 greenY: 0.550
(II) intel(0): blueX: 0.155 blueY: 0.130   whiteX: 0.315 whiteY: 0.330
(II) intel(0): Manufacturer's mask: 0
[...] listed modes skipped [...]
(II) intel(0): EDID for output DVI1
(II) intel(0): Manufacturer: SNY  Model: 4000  Serial#: 16843009
(II) intel(0): Year: 2005  Week: 46
(II) intel(0): EDID Version: 1.3
(II) intel(0): Digital Display Input
(II) intel(0): Max Image Size [cm]: horiz.: 38  vert.: 30
(II) intel(0): Gamma: 2.20
(II) intel(0): DPMS capabilities: StandBy Suspend Off
(II) intel(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4
(II) intel(0): First detailed timing is preferred mode
(II) intel(0): redX: 0.641 redY: 0.353   greenX: 0.289 greenY: 0.626
(II) intel(0): blueX: 0.142 blueY: 0.078   whiteX: 0.313 whiteY: 0.329
[...]
(II) intel(0): Output VGA1 disconnected
(II) intel(0): Output LVDS1 connected
(II) intel(0): Output DVI1 enabled by config file
(II) intel(0): Output TV1 disconnected
(II) intel(0): Using exact sizes for initial modes
(II) intel(0): Output LVDS1 using initial mode 1280x1024
(II) intel(0): Output DVI1 using initial mode 1280x1024
(II) intel(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.
(==) intel(0): video overlay key set to 0x101fe
(++) intel(0): DPI set to (86, 86)

Regards,
Juergen