backlight issue with an Acer Iconia Dual Screen

backlight issue with an Acer Iconia Dual Screen

[Mathieu Magnaudet]

Hi all

I am trying to install a fedora 16 on an Acer Iconia, a laptop with a 
double touch screen. Thanks to a recent patch in the Intel graphics 
driver, the second touch screen is now well recognized. However the 
backlight is set to the minimal value and there is no way to control it 
(only the backlight of the first screen can be changed).
The log suggests that two control interfaces for backlight are found:

[    30.752] (II) intel(0): Output LVDS1 has no monitor section
[    30.758] (II) intel(0): found backlight control interface 
/sys/class/backlight/acpi_video0
[    30.758] (II) intel(0): Output VGA1 has no monitor section
[    30.851] (II) intel(0): Output LVDS2 has no monitor section
[    30.856] (II) intel(0): found backlight control interface 
/sys/class/backlight/acpi_video0

In the /sys/class/backlight directory there is an acpi_video0 directory 
that seems rightly initialized and there is also an intel_backlight 
directory but with a max_brightness set to 1.

Do you think that the problem comes from the driver?

Thanks a lot

Mathieu
-- 
Mathieu Magnaudet - Chercheur
Laboratoire d'Informatique Interactive
ENAC - 7 av Edouard Belin
31055 TOULOUSE CEDEX 4
(phone) +33 562 174 217