Bug 321580

On a laptop using the i915 kernel module, and where the brightness setting is inverted, KDE turn off the screen when I log in, and turn in back on again when the screen saver kick in.

The machine in question need and uses the invert_brightness=1 option passed to the i915 kernel module to avoid turning off the screen during boot, but the powerdevil KDE module do not seem to be aware of this and turn the screen off during login instead.

Reproducible: Always

Steps to Reproduce:
1. Buy a machine with Intel HD video card.
2. Install kubuntu using the i915.invert_brightness=1 boot option
3. Set it on first boot too.
4. Make sure to set it permanently by running this as root
  echo options i915 invert_brightness=1 | sudo tee /etc/modprobe.d/i915.conf
  sudo update-initramfs -u -k all
5. Try to log into KDE.

Actual Results:  
The screen turn black.

Expected Results:  
I expected the screen to stay lit, and to be able to use KDE.

This is the brightness setting when the screen is lit:

% for interface in /sys/class/backlight/*; do echo $interface; cat $interface/max_brightness; cat $interface/actual_brightness; done
/sys/class/backlight/acpi_video0
100
0
%