http://bugzilla.kernel.org/show_bug.cgi?id=15204





--- Comment #21 from John <infynidybusine...@yahoo.com>  2010-03-10 19:23:09 ---
Sachin,

I must say, those are great specs. Core i7 w/ 4+ gigs DDR3, sweet. So I've
looked at it and I see that the video device is an "IGD", and it says
"enabled", whereas mine says "Intel Cantiga Chipset Family", "Disabled". It's a
real shame, probably a great laptop. I love mine.

I noticed that I am able to change the brightness if I press Fn+F8, it's the
contrast control sequence. If I press it twice, it will dim the screen all the
way to what seems like the lowest brightness, and if I do it again, it will
raise it back to full. 

That only works for a few times, then DMESG states ACPI Warning: _BQC returned
an invalid level (20100121/video-638)

I wish I could debug it myself and figure out exaclty where the problem is. I
looked in the ACPI tree and opened the video file, I've seen all these methods
in there, for controlling the brightness, but I dont' see where the problem is.


(In reply to comment #20)
> (In reply to comment #18)
> > Sachin,
> > 
> > Wow, that's unheard of. Do you mind showing me the output of your 
> > dmi-decode?
> > 
> > (In reply to comment #17)
> > > Thanks John
> > > 
> > > I tried kernel kernel-2.6.34-0.10.rc1.git0.fc14 but my laptop wont even 
> > > boot.
> > > It hangs while loading the kernel
> 
> Here you go ..
> 
> Thanks.

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