Re: lcd backlight

[Jonathan Steinert <hachi-rIxVFxJalAJeoWH0uzbU5w@public.gmane.org>]

I'm in a jam, I've got an Nvidia Geforce 4 440 Go, and /every/ time I 
see a backlight control it is for a radeon. Does anyone have one for 
nvidia chipsets? or does anyone have hints on how to build one? I'm not 
much of a C programmer, but I might be able  to fiddle my way though it.

Now, the reasoning why I posted this to the ACPI list? Because when I 
enable ACPI (with a patched DSDT) on my Dell Inspiron 8200, and create 
any events (S1, close lid, etc.) the display is off (both the LCD and 
the backlight turn off) until I reboot. If you have any hints on how to 
fix this instead, that would be much appreciated.

Thanks much,

Jonathan Steinert

James H. Cloos Jr. wrote:

>A bios setting causes a regular screen blank, but w/ acpi the lcd's
>backlight is left on.  
>
>The following function (based on 's radeontools) controls the
>backlight perfectly:
>
>void radeon_cmd_light(int param)
>{
>    unsigned long dac_cntl;
>
>    dac_cntl = radeon_get(RADEON_LVDS_GEN_CNTL,"RADEON_LVDS_GEN_CNTL");
>    if(param != 0) {
>        dac_cntl |= RADEON_LVDS_ON;
>    } else {
>        dac_cntl &= ~ RADEON_LVDS_ON;
>    }
>    radeon_set(RADEON_LVDS_GEN_CNTL,"RADEON_LVDS_GEN_CNTL",dac_cntl);
>}
>
>
>What needs to be done, given this info on how to control the
>backlight and the bios's dsdt, to convince the kernel to toggle
>the backlight when the screen blanks?
>
>-JimC
>
>
>
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