[Bug 207473] Re: Screen brightness double level changes

[Mathias Burén]

I experience the same behaviour as above. Inrepid 8.10 final, Dell
Inspiron 1520, using NVIDIA 177.80 on a 8600M GT. There are 7 levels of
brightness supported by the hardware:

root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# ls
actual_brightness  brightness      power      uevent
bl_power           max_brightness  subsystem
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 1 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 2 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 3 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 4 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 5 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 6 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 7 > brightness 
root at fackamato-laptop:/sys/devices/virtual/backlight/acpi_video0# echo 8 > brightness 
bash: echo: write error: Invalid argument

There is also a acpi_video1 directory, with same files. They also change
the brightness of the LCD monitor.

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Screen brightness double level changes
https://bugs.launchpad.net/bugs/207473
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