I have an Acer Aspire 5742G latop with Ubuntu 12.04.5 LTS. Firstly I had a problem with the brightness (I couldn't change it) but afer I changed GRUB_CMDLINE_LINUX_DEFAULT value to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
the brightness problem was solved.
But now when I change the brightness by pressing Fn + left arrow/right arrow, all the windows that are open starts flickering and every time I press any button they flicker again.
Problem Solved!
After Changing brightness screen stops flickering if I press Alt + SysRq + r.
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