[tlinux-users:07851] Re: LCD Brightness not working

Hi Jaime,

I cannot directly help you but I have a suggestion.

I have a Tecra A3 and I have found that the Black Security Screen
Saver on Win XP turns the backlight off completely and that the
Fn+F6/F7 keys turn brightness off and on even when I have linux
running. If your kbd works this way, maybe you can find a way of
generating those keystrokes / work out how the screensaver works?

Cheers,

MarkL


On 09/06/06, Jaime <[email protected]> wrote:
> Hi all, I have a Satellite A100-166 and I'm trying to make work the
> LCD brightness, specially to maximize time of battery.
> There is no support in kernel for this laptop because the module
> toshiba_acpi uses ACPI methods _SB_.VALD.GHCI and _SB_.VALZ.GHCI which
> doesn't exists in my ACPI DSDT table. So that module can't work.
>
> I have revised DSDT table (using disassembler iasl) and search for
> _BCM method (which is suppose to be the one to change brightness) and
> I tried to use that method with no result. Also I watch what the
> method was doing: Store in register PO80 the value of the brightness,
> and that register is defined to be in SystemIO 0x80. I changed that
> value "manually", but also with no result.
>
> I also tried a module for tecra (the one whose link is in toshiba's
> web) , with no result.
>
> In the SCI_HCI.pdf specification of toshiba appears that ACPI methods
> (VALD.GHCI and VALZ-GHCI) that I should use to modify things like
> power, usb, etc, but that methods doesn't exist in my laptop.
>
> I attach the result of my dsdt disassembled just in case it could be
> useful for knowing what is happening.
>
> Does anyone have support for the LCD brightness for that model or have
> info about it?
>
> Could someone with support for LCD brightness of other model send me
> the /proc/acpi/dsdt file so I could compare with mine?
>
> Thanks!
>
> Jaime
>
>
>