Mailinglist Archive: radeonhd (408 mails)

[Alex Deucher <alexdeucher@xxxxxxxxx>]

2009/6/30 Rafał Miłecki <zajec5@xxxxxxxxx>:
> W dniu 30 czerwca 2009 17:32 użytkownik Egbert Eich <eich@xxxxxxx> napisał:
> >  > So I can add "UseAtomBIOS", remove all NOT_YET and this should work
> >  > for me? Because you mentioned earlier it's not ready yet...?
> >
> > You don't even have to remove the NOT_YET with thoe UseAtomBIOS option.
> > I'm currently looking at why I added the NOT_YETs. It's working on RS690
> > (LVTMA). I still need to try it on DIG.
>
> OK, I just tested it and it works actually.
>
> I decided to check out atombios's check about backlight control.
>
> 1) In rhd_dig.c we call RhdAtomSetupBacklightControlProperty which
> returns bl level
>
> 2) in rhd_atomout.c: RhdAtomSetupBacklightControlProperty calls
> RHDAtomBIOSScratchBlLevel
>
> 3) in rhd_biosscratch.c: RHDAtomBIOSScratchBlLevel just check 0x18 /
> 0x172C register.

Those are the bios scratch regs.

> So is this AtomBIOS based backlight control just using another
> register? No special AtomBIOS commands?

As I said previously, IIRC, it's controlled by LCD1OutputControl on
pre-DCE3 chips, and DIG2TransmitterControl on DCE3 and newer chips.
As I recall, you set the requested level in one of the bios scratch
regs and then execute the table with the action set to the appropriate
LCD_BLOFF/BLON/BL_BRIGHTNESS_CONTROL for the table.  See atombios.h.

Alex
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