Hi Bruno,

thanks for your patch [*] to implement the ACPI VGA display
extensions, as promised, I gave it a shot on my machine with Linux
kernel 2.6.2 (swsusp2, ACPI20040116, ACPI/APIC fix).

The patch applied cleanly and the kernel compiled fine.


During boot, things look not too bad

 ACPI: AC Adapter [AC0] (on-line)
 ACPI: Battery Slot [BAT0] (battery present)
 ACPI: Power Button (FF) [PWRF]
 ACPI: Sleep Button (CM) [SLPB]
 ACPI: Lid Switch [LID]
 ACPI: Fan [FN00] (off)
 ACPI: Video Device [VGA] (multi-head: yes  rom: no  post: no)
 ACPI: Processor [CPU1] (supports C1 C2 C3, 8 throttling states)
 ACPI: Thermal Zone [THRM] (53 C)
 Asus Laptop ACPI Extras version 0.27
   M2N model detected, supported


Doing a tree /proc/acpi/video/ shows

 /proc/acpi/video/
 `-- VGA
     |-- CRTD
     |   |-- EDID
     |   |-- brightness
     |   |-- info
     |   `-- state
     |-- LCDD
     |   |-- EDID
     |   |-- brightness
     |   |-- info
     |   `-- state
     |-- POST
     |-- POST_info
     |-- ROM
     `-- info

(is it normal that CRT and LCD have another "D" at the end?)


Doing a cat on the different nodes gives for LCD:

cat ./LCDD/EDID
<not supported>
 
cat ./LCDD/brightness
<not supported>
 
cat ./LCDD/state
state:     0x1f
query:     0x01
 
cat ./LCDD/info
device_id:    0x0400
type:         UNKNOWN
known by bios: yes


And for CRT:

cat ./CRTD/EDID
<not supported>
 
cat ./CRTD/brightness
<not supported>
 
cat ./CRTD/state
state:     0x1d
query:     0x00
 
cat ./CRTD/info
device_id:    0x0100
type:         CRT
known by bios: yes


And finally POST:

cat ./POST
<not supported>
 
cat ./POST_info
<not supported>
 
cat ./ROM
<TODO>
 
cat ./info
Switching heads:              yes
Video ROM:                    no
Device to be POSTed on boot:  no
 

Suspend to RAM seemed to work fine, however, there was the usual
trouble upon powering back up: