Toggling VGA out on Eee 901

Dear Experts,

I'm trying to work out how to get console video out toggling working on my ASUS EEE 901 (running Debian). I get the feeling that I may be the first person to try to do this, and I knew almost nothing about ACPI until a couple of hours ago. Can anyone help?
Output toggling for X works fine, but that doesn't use ACPI.

If the
machine is booted with an external monitor connected, console VGA out is enabled; if the monitor is not connected it's not enabled. Looking in /proc/acpi/video/VGA/CRTD/state I see

state: 0x1f
query: 0x01

when the machine was booted with the monitor connected and

state: 0x0d
query: 0x00

when the machine was booted without the monitor. Following the advice of an old ACPI HOWTO I tried to store 0x80000001 in that file:

# /bin/echo 0x80000001 > /proc/acpi/video/VGA/CRTD/state
/bin/echo: write error: Bad address

I had a look at my iasl-disassembled /proc/dsdt and found this:

Device (VGA)

{
     .....
     Name (DONE, Zero)
     .....

     Device (CRTD)
     {
         .....
         Method (_DSS, 1, NotSerialized)
         {
             If (And (Arg0, 0x40000000))
             {
                 If (And (Arg0, 0x80000000))
                 {
                     Store (One, DONE)
                 }
             }
         }
     }
}

I have never looked at this stuff before, but I don't get the impression that it's actually going to do anything to the hardware registers, is it? Am I looking in the wrong place? Based on that I did try to store 0xC0000000 and 0xC0000001, and in this case there was no "Bad address" error - but no output change either.

Can someone point me in the right direction?
I have put the complete dsdt.dsl here: http://chezphil.org/tmp/eee_901_dsdt.dsl

Many thanks, Phil.

(Please cc: me in any replies)

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Hi, phil,

Quoted 2 lines · Phil Endecott

Dear Experts,

Quoted 2 lines

I'm trying to work out how to get console video out toggling working on my ASUS EEE 901 (running Debian). I get the feeling that I may be the first person to try to do this, and I knew almost nothing about ACPI until a couple of hours ago. Can anyone help? Output toggling for X works fine, but that doesn't use ACPI.

well, ACPI control method for video output switching seldom works. And we use xrandr to switch the display in X.
I'm not sure but I'm afraid we don't have the plan to support video output switch in console mode.

Hi Rui,

Quoted 6 lines · Zhang Rui

Hi, phil,

Quoted 3 lines · Phil Endecott

Dear Experts,

I'm trying to work out how to get console video out toggling

working on

Quoted 1 line

Quoted 1 line

my ASUS EEE 901 (running Debian). I get the feeling that I may be

the

Quoted 1 line

Quoted 1 line

first person to try to do this, and I knew almost nothing about

ACPI

Quoted 2 lines

Quoted 2 lines

until a couple of hours ago. Can anyone help? Output toggling for X works fine, but that doesn't use ACPI.

Quoted 4 lines

well, ACPI control method for video output switching seldom works. And we use xrandr to switch the display in X.
I'm not sure but I'm afraid we don't have the plan to support video output switch in console mode.

As far as I can see, the code already exists in the kernel to support this. The problem is that this BIOS doesn't define the necessary methods (unless I've misunderstood something).

When you say "don't plan
to support", do you mean that the existing kernel functionality is now deprecated,