When using the nouveau driver, there is a folder in
/sys/class/backlight/nv_backlight/ which contains the max_brightness (1025)
and
brightness as expected. After digging around a bit, in the kernel source I
found these lines of code:
/* We do not have any information about which values are allowed, thus we
used safe values
*/
#define MIN_LEVEL 0x158 (344 decimal)
#define MAX_LEVEL 0x534 (1332 in decimal)
In the file linux/drivers/video/nvidia/nv_backlight.c (picked up from
apt-get source linux-2.6)
Based on the filename and how close those numbers are to 1025, I would guess
that this is the code determining my max brightness. More like hoping, than
guessing really.
Can anyone provide any insight about this, perhaps? Might hacking this file
with a kernel recompile change the max_brightness?
Thanks,
Matt
On Fri, Nov 12, 2010 at 1:16 PM, Camaleón wrote:
> On Fri, 12 Nov 2010 08:51:39 -0500, Matt Simmons wrote:
>
> > I am running Squeeze on my laptop: a macbook pro 7,1.Most is going well,
> > except the backlight screen brightness. Using the nouveau driver (this
> > laptop has a 320M), it sets my max_brightness to 1025 according to
> > /sys/. Unfortunately, a brightness of 1025 is extremely dim, and
> > supposedly the brightness should be more like 40,000 on this guy.
> > Anyway, installing the NVidia proprietary driver yields strange results
> > (download from NVidia, not debian repos), there is nothing in the folder
> > /sys/class/backlight at all! Kernel 2.6.32-5 amd64.
>
> Maybe related to this (message #25)?
>
> pommed: brightness control no longer working on macbook pro
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=591264
>
> Greetings,
>
> --
> Camaleón
>
>
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