Laptop screen not turning off in ACPI S1
Vibol Hou
vibol at khmer.cc
Sat May 8 20:11:58 UTC 2004
Just out of curiousity, I was reviewing the kernel proper for the code
that is executed as the system enters suspend and it appears to be
allocating a VT and switching to it to display debug messages. This
appears to be causing my screen to switch back on since I have a script
that shuts off my display when I initiate sleep mode (script found at:
http://ltswww.epfl.ch/~dsanta/resources/dell-i8500-linux). I modified
the script to work with 2.6.
My question is; is it necessary for the kernel to do all this terminal
switching? I'm tempted to patch the kernel to remove the
allocation/switching/debug code but I'd like to know if this was done
for a reason (other than to output the debug messages).
-Vibol
Alexandre Oliva wrote:
> On May 7, 2004, Vibol Hou <vibol at khmer.cc> wrote:
>
>
>>When I issue an echo -n "1" > /proc/acpi/sleep, my laptop (Dell Lat
>>C400) enters the state, but the laptop screen does not turn off. Is
>>there a way of getting the laptop screen to turn off in S1?
>
>
> The ugly work around I found on my Dell Inspiron 8000 was to run:
>
> sleep 5; echo ...
>
> and then close the lid, such that the display is turned off. Then,
> when you enter the sleep state, it remains so.
>
> Yeah, yuck :-/ But it works :-)
>
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