Re: Switching LCD off on a laptop (or change to CRT)

Ducrot Bruno
2002-09-23T15:35:50Z

Hi Mario,

On Mon, Sep 23, 2002 at 04:11:35PM +0200, Mario Lang wrote:
> hello.
>
> I recently got a JVC MP-XP7210DE. First of all, congrats,
> ACPI worked out of the box with 2.4.20pre7. I have correct
> ac_adaptor info, correct battery info (even for both
> slots), and the power button works too under acpid.

Have you patched your kernel with the current acpi for linux,
or did you mean the 'old' one?

>
> One remaining glitch I have is getting the internal
> display to switch off. Under XP, this works fine
> with Fn-F10. If I do this under Linux, I get a message
> telling me that this button is not implemented (on the console).

Could you send the actual message, please ?

>
> Well, that indicates that this LCD display off thing
> must be done by the operating system.
>
> Well, I'm blind[1], and I realllllly don't need that display,
> and switching it off would save alot of power. Any hint
> on what I could try to achieve this would be very helpful.
>
> Does any of the acpi patches already support that? I think
> it should be a acpi standard, as there is a screen
> saver for Windows NT which does exactly that via ACPI (turn
> the display off).

VGA stuff are not supported for now under linux, even though it
could be done.

Could you send me your DSDT, so that I can try to get it worked
with your system?

For this, you need to get pmtools (from intel site) and do something
like:

wget http://developer.intel.com/technology/iapc/acpi/downloads/pmtools-20010730.tar.gz
tar xzvfp pmtools-20010730.tar.gz
cd pmtools-20010730
make
cd acpidmp
./acpidmp DSDT > dsdt (as root!)
gzip dsdt

then send me the resuling dsdt.gz.

I will look for a really nasty hack for your purpose, then.

Cheers,

--
Ducrot Bruno
http://www.poupinou.org Page profaissionelle
http://toto.tu-me-saoules.com Haume page