Lightdm flashes twice(as if it reloads itself) & resets brightness to max when logging out (Utopic)

[Khurshid Alam]

After fresh install of Ubuntu 14.10, I am experiencing a weird problem:

When I log out from Unity session (or any other desktop session) Lightdm flashes twice (as if it reloads itself twice) & sets the brightness to max.

I set following setiing to /etc/rc.local to preserve my brightness settings.

echo 3 > /sys/class/backlight/acpi_video0/brightness
echo 2997708 > /sys/class/backlight/intel_backlight/brightness

 When I log in at boot it flashes but doesn't alter brightness. The problem occurs if I logout or restart lightdm manually from text-termial (ctrl+alt+f1, sudo service lightdm restart). I have attached lightdm & x-0 & x-o-greeter log files.

Output of "lshw -c video"

*-display:0
       description: VGA compatible controller
       product: Mobile GME965/GLE960 Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 0c
       width: 64 bits
       clock: 33MHz
       capabilities: vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:45 memory:e8400000-e84fffff memory:d0000000-dfffffff ioport:6000(size=8)