How to turn off the backlight?

[Pierre-Luc Drouin]

Yes, I have it. But I thought there was a way to turn the backlight off 
from the terminal?

Andrew Wu wrote:

>Did you add "Option  "DPMS" in the Monitor section of 
>your /etc/X11/xorg.con file?
>
>Andrew.
>
>On Sun May 22 2005 10:02, Pierre-Luc Drouin wrote:
>  
>
>>Hi,
>>
>>I got a new Dell laptop (Precision M70). I would like to know how I
>>can turn off the backlight of the LCD. The backlight doesn't turn off
>>when I flip down the screen or when asked by xscreensaver.
>>
>>I've also tried the different sleep states without success. S1 and S2
>>don't seem to be supported and I get "acpi0: device_suspend failed"
>>when I try S3 or S4.
>>
>>Thanks
>>
>>FreeBSD 5.4-RELEASE #0: Thu May 19 23:21:03 EDT 2005
>>...
>>acpi0: <DELL CPi R  > on motherboard
>>acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
>>cpu0: <ACPI CPU (4 Cx states)> on acpi0
>>acpi_throttle0: <ACPI CPU Throttling> on cpu0
>>acpi_acad0: <AC Adapter> on acpi0
>>acpi_cmbat0: <Control Method Battery> on acpi0
>>acpi_cmbat1: <Control Method Battery> on acpi0
>>acpi_lid0: <Control Method Lid Switch> on acpi0
>>acpi_button0: <Power Button> on acpi0
>>acpi_button1: <Sleep Button> on acpi0
>>pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
>>acpi_tz0: <Thermal Zone> on acpi0
>>atkbdc0: <Keyboard controller (i8042)> port 0x66,0x62,0x64,0x60 irq 1
>>on acpi0
>>sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10
>>on acpi0
>>...
>>nvidia0: <Quadro FX Go1400> mem
>>0xde000000-0xdeffffff,0xc0000000-0xcfffffff,0xdd000000-0xddffffff irq
>>16 at device 0.0 on pci1
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>>
>
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