I bought the new ultrabook Sony VAIO SVT1311. Many things work but brightness control doesn't. I see the splash bubble (that reacts to Fn+F5 and Fn+F6) but the brightness doesn't change. It stays permanent at 100% and I can't do anything with it. The graphics card is integrated Intel HD3000.
To get working brightness key. try following
Change this line
to something like below
It is still possible ubuntu won't remember your brightness settings. So you have to change brightness each time.
Please let us know the result as many sony users are facing this problem.
Update: This is for setting brightness manually.
Try following for both path shown by
Get the maximum brightness:
Try a lower value to set the brightness, say output is 2048 so I will try with half of it
If this works, make this happen in each login automatically by doing the following
Enter this line just before
I have another question. Does your system has hybrid graphics card? whats the output of
Also you can try with xdotool
adding acpi_backlight=vendor to the grub command line like suggested above did not help in my case. My workaround was to use the intel_backlight command from command line.