Laptop backlight/S1 in 2.6.6 vanilla

Laptop backlight/S1 in 2.6.6 vanilla

[Vibol Hou]

I'm running vanilla 2.6.6 on a dell latitude c400 (fedora core 2).  I 
have my sleep script set to shut off the display backlight in X before 
echo 1 > /proc/acpi/sleep, but the backlight turns back on the moment my 
machine enters sleep mode.  does anyone have any idea why this is happening?

-Vibol


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Re: Laptop backlight/S1 in 2.6.6 vanilla

[Stefan Dösinger]

> I'm running vanilla 2.6.6 on a dell latitude c400 (fedora core 2).  I
> have my sleep script set to shut off the display backlight in X before
> echo 1 > /proc/acpi/sleep, but the backlight turns back on the moment my
> machine enters sleep mode.  does anyone have any idea why this is
> happening?
I guess you use <xset dpms force off> to turn the backlight off.
The kernel switches from X to the console, and that turns the backlight on 
again.
What  video card do you have? Perhaps loading a frame buffer kernel driver for 
your card helps.


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Re: Laptop backlight/S1 in 2.6.6 vanilla

[Pavel Machek]

Hi!

> I'm running vanilla 2.6.6 on a dell latitude c400 (fedora core 2).  I 
> have my sleep script set to shut off the display backlight in X 
> before echo 1 > /proc/acpi/sleep, but the backlight turns back on the 
> moment my machine enters sleep mode.  does anyone have any idea why 
> this is happening?

Kernel switches to text console and stops processes.
It should not be neccessary for S1 and is likely to cause
your problem.
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Re: Laptop backlight/S1 in 2.6.6 vanilla

[Vibol Hou]

Is it safe to comment out the code that's switching the VC?
-Vibol

>Kernel switches to text console and stops processes.
>It should not be neccessary for S1 and is likely to cause
>your problem.
>  
>



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Re: Laptop backlight/S1 in 2.6.6 vanilla

[Vibol Hou]

I commented out pm_prepare_console() and pm_restore_console() in 
kernel/power/main.c and the screen no longer turns back on.  However, 
I'm still uncertain if this is safe.  What I do notice is that some 
keyboard input still makes it into the terminal where I have initiated 
sleep from while the machine is in S1 so it appears after I wake up the 
machine.

Somehow, this has also resolved another problem I had with the machine 
cycling in and out of S1 mode a few times before finally staying awake.

-Vibol

Pavel Machek wrote:

>Hi!
>
>  
>
>>I'm running vanilla 2.6.6 on a dell latitude c400 (fedora core 2).  I 
>>have my sleep script set to shut off the display backlight in X 
>>before echo 1 > /proc/acpi/sleep, but the backlight turns back on the 
>>moment my machine enters sleep mode.  does anyone have any idea why 
>>this is happening?
>>    
>>
>
>Kernel switches to text console and stops processes.
>It should not be neccessary for S1 and is likely to cause
>your problem.
>  
>



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Re: Laptop backlight/S1 in 2.6.6 vanilla

[Pavel Machek]

Hi!

> I commented out pm_prepare_console() and pm_restore_console() in 
> kernel/power/main.c and the screen no longer turns back on.  However, 
> I'm still uncertain if this is safe.  What I do notice is that some 
> keyboard input still makes it into the terminal where I have initiated 
> sleep from while the machine is in S1 so it appears after I wake up the 
> machine.

It should be safe for S1. Not sure about S3, and it is bad idea for
S4.

> Somehow, this has also resolved another problem I had with the machine 
> cycling in and out of S1 mode a few times before finally staying awake.

Good.
									Pavel

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