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

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

[Mario Lang]

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.

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).

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).

[1] Yeah, don't be supprised, that works really nicely.
I use speech and braille output (mostly speech while I'm mobile though),
and the display is really just a waste of energy most of the time.

P.S.: Sorry to bother the -devel list with that, but it
is very very difficult to get competent answers for
ACPI questions.  All HOWTOs seem to still refer
to APM, and well, this notebook doesnt seem to have apm.

-- 
CYa,
  Mario



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

[Pavel Machek]

Hi!
> and switching it off would save alot of power.  Any hint
> on what I could try to achieve this would be very helpful.

Well, small hardware hack to make notebook think LID is closed might do
the trick :-)
								Pavel
-- 
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.



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

[Ducrot Bruno]

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


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

[Mario Lang]

Ducrot Bruno <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org> writes:

>> 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?
No, I ment the 'old' acpi.  I now patched 2.4.20-pre7 with acpi20020918,
and everything works fine.
>> 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 ?
Under acpi20020918, it does no longer happen.

-- 
CYa,
  Mario


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

[Jurgen Kramer]

Hi,

I have the Japanese version of this laptop (Victor MP-XP7210) do the
Fn+F4, Fn+F5, Fn+F6 and Fn+F7 work for you? I asked a question about
this on the maillist but there no reply.

BTW Fn+F10 works for me with kernel 2.4.19 + ACPI 20020918. The LCD does
go off. I do not have the VGA connector cable so I cannot see if it
switches to VGA output.

Cheers,

Jurgen

On Mon, 2002-09-23 at 16:11, 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.
    
    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).
    
    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).
    
    [1] Yeah, don't be supprised, that works really nicely.
    I use speech and braille output (mostly speech while I'm mobile though),
    and the display is really just a waste of energy most of the time.
    
    P.S.: Sorry to bother the -devel list with that, but it
    is very very difficult to get competent answers for
    ACPI questions.  All HOWTOs seem to still refer
    to APM, and well, this notebook doesnt seem to have apm.
    
    -- 
    CYa,
      Mario
    
    
    
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Re: Switching LCD off on a laptop (or change to CRT)

[Mario Lang]

Jurgen Kramer <gtm.kramer-c1aixF9oqgPk1uMJSBkQmQ@public.gmane.org> writes:

> I have the Japanese version of this laptop (Victor MP-XP7210) do the
> Fn+F4, Fn+F5, Fn+F6 and Fn+F7 work for you?

No.

> BTW Fn+F10 works for me with kernel 2.4.19 + ACPI 20020918. The LCD does
> go off. I do not have the VGA connector cable so I cannot see if it
> switches to VGA output.
Thanks for that tip, it actually works!

I'm using 2.4.20-pre7-acpi-20020918 now, and it boots fine,
all devices continue to work, Fn+F10 switches my LCD off, and
setting limit in /proc/acpi/processor/CPU0/ also works, nice!

(Btw, I'm wndering why it always shows P0:T0 as active state,
even if I do nothing on the machine.  Is there a way to
set it such that it automatically sets T1 or some higher state it the
system load is effectively 0?

-- 
A happy,
  Mario


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

[Gustavo Sverzut Barbieri]

[-- Attachment #1: Type: text/plain, Size: 391 bytes --]

Hello,

As I have the same problem as the guy has, I'm sending my dsdt file.
I have one of those cheap "desknote" notebooks
(http://www.desknote.biz).

I can't get LCD off.



Gustavo


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[-- Attachment #2: dsdt.gz --]
[-- Type: application/x-gzip, Size: 4581 bytes --]