Re: [PATCH] Rationalise ACPI backlight implementation

[Romano Giannetti]

On Sat, 2008-02-02 at 09:30 -0200, Henrique de Moraes Holschuh wrote:
> On Fri, 01 Feb 2008, Len Brown wrote:
> > You might check if CONFIG_ACPI_VIDEO=m is set and you can load the "video" module.
> > While the sony may be non-standard and not load, your thinkpad may work.
[...]
> 
> We really need to solve the userspace mess, though.
> 

I do not know if this is relevant... but for example, with a i915 hw
here (toshiba laptop):

#cat max_brightness 
100

#echo 50 > brightness ; cat actual_brightness 
0
#echo 60 > brightness ; cat actual_brightness 
0
#echo 70 > brightness ; cat actual_brightness 
70
#echo 80 > brightness ; cat actual_brightness 
0
#echo 90 > brightness ; cat actual_brightness 
0
#echo 100 > brightness ; cat actual_brightness 
100

#uname -a
Linux rukbat 2.6.24 #13 SMP PREEMPT Fri Feb 1 13:12:23 CET 2008 i686 GNU/Linux

which is at least strange (and probably broken). actual_brightness is
real, when it says 0 backlight is off. You can imagine what happens
using the backlight up/down control... flashing lights! 

Romano


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