[ltp] thinkpad-acpi release 0.19-20080213 uploaded to ibm-acpi.sf.net

[Alex Deucher]

On Fri, Feb 15, 2008 at 1:57 PM, Henrique de Moraes Holschuh
<hmh@hmh.eng.br> wrote:
> On Fri, 15 Feb 2008, CC.Fan@gmx.de wrote:
>  > > Yeah, the nVidia drivers aren't good for that.  You will have to either use
>  > > ACPI video.c, or thinkpad-acpi brightness_enable=1 (don't use both), and
>  > > the kernel method for xbacklight.
>  >
>  > how do I switch to xbacklight kernel-mode?
>
>  I just looked after it. Apparently, it is a function of the X server
>  selected by a xrandr property, which I suppose to be only available on the
>  Intel X server...  Good to know, I *was* wondering why I couldn't find a way
>  to change xbacklight modes in the ATI driver.
>
>  xorg-xserver-video-ati seems to support a backlight RandR property... Only,
>  it doesn't work in the T43 (yet, I hope).  I have no idea about the nVidia
>  drivers.

I still need to sort that out.  Your best bet is to just use the acpi
method for backlight control now as different oems control the
backlight differently.  On some setups you can control the backlight
via the LVDS control registers, on others the backlight is controlled
via GPIO.  I haven't yet found a reliable way to tell which is
implemented.

Alex