Yes.....Values changes....but not brightness...
root@ale-SATELLITE-L755:/home/ale# echo 1 | tee 
/sys/class/backlight/acpi_video0/brightness
1
root@ale-SATELLITE-L755:/home/ale# cat 
/sys/class/backlight/acpi_video0/max_brightness
7
root@ale-SATELLITE-L755:/home/ale# cat 
/sys/class/backlight/acpi_video0/brightness 
1
root@ale-SATELLITE-L755:/home/ale# cat 
/sys/class/backlight/acpi_video0/actual_brightness 
1
root@ale-SATELLITE-L755:/home/ale# cat 
/sys/class/backlight/acpi_video0/bl_power 
0


Thaks!!

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https://bugs.launchpad.net/bugs/850065

Title:
  Brightness control on Toshiba Satellite L755

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