acpi_video on SONY VAIO PCG-Z1 [was: acpi_video users needed]

takawata at takawata at
Mon Aug 30 22:02:40 PDT 2004

In message <1093891970.1195.25.camel at localhost>, Vladimir Grebenschikov wrote:
>On Tue, 2004-08-31 at 03:31 +0900, takawata at wrote:
>> >> >Is any chance to make acpi_video work on SONY VAIO PCG-Z1 ?
>> >> >acpi_video.ko loads well, but does not report anything, and does not add
>> >> > subtree.
>> >> >
>> >> >Please advise.
>> >> 
>> >> Because the ACPI device object has not enough interfaces to get the
>> >> acpi_video driver work.
>> >> Acpi_video driver does not check PCI device class: it checks the 
>> >> interfaces instead. 
>> >> You don't need to bother attaching acpi_video driver.
>> >
>> >Ok, And what conclusion "no-way" ?
>> You may hack the driver to do so.:-)
>Oh ... first i need to hack WinXP driver to find how to control LCD
>> But, in your machine, the driver does not work anything but
>> recognize that the video adaptor has 3 way output. And
>> you can't use acpi_video, if you want to use DRM or nvidia kernel module.
>I have ATI RADEON MOBILITY, so no need nvidia module.
>Can you provide me a bit of theory ? 
>Who usual responsible for LCD bacllight control ? 
>   video-chip(ATI) / chipset(Intel) / special device on bus ?

It seems to be controlled by Special device on bus called embedded controller.
You can use it with setbrightness in ports/sysutils/sjog or
 ports/graphics/picturebook. But these tools are a bit dangerous because
it will conflict with ACPI(These tools are based on disassembled AML before
ACPI support is not populler in free unicies.)
I just wrote a driver for it. I hope it will help you.

>Is this problem related to inability to "wakeup" after suspend:
>"notebook alive, response on keys, but screen is not initialized
>changing syscons/X doesn't help"
>Is "learning" acpidumps of other SONY notebooks, compatible with
>acpi_video, can help ?
>I suspect there is no public spec for such kind of things, isn't it ?

You may want to look into Device(SNC).

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