http://bugzilla.kernel.org/show_bug.cgi?id=14671





--- Comment #16 from Zhang Rui <[email protected]>  2009-12-09 03:15:20 ---
(In reply to comment #13)
> The "nv" driver apparently does not support my GPU.  
> 
> Zhang, I will have to respectfully disagree with you about it being an nvidia
> driver problem anyway, I've spoken to someone on nvnews.net forum with the 
> same
> GPU using linux and that person reports that brightness can be adjusted on his
> machine. 

How does he control the backlight?

I just want to say that the backlight can not be controlled via ACPI because
ACPI just offers the backlight control methods for the integrated graphics
card, which is not available on your laptop. but anyway it works occasionally,
so you can still try the custom DSDT in comment #15.

Native graphics driver controls the backlight in some cases, especially for the
nvidia graphics cards.

If the custom DSDT in comment #15 doesn't work for you, I suggest you to open a
bug at bugs.freedesktop.org to see if the nvidia experts there can help.
Because there is little that we ACPI guys can help here. :(

BTW: I remember that there was once a tool named smartdimmer which can be used
for brightness switching for nvidia graphics.

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