Bug#695320: Not an xorg problem
Reading the log, I noticed that xorg is using "/sys/class/backlight/samsung/brightness" to set the brightness.
I tried to set the brightness via "echo -n 3 > /sys/class/backlight/samsung/brightness" and the same problem showed up, so this isn't an xorg problem. Sorry to have wasted your time. Should I report again on the linux-image package?
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