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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 to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux" the brightness problem solved.

But now when I change the brightness by pressing Fn + left arrow/right arrow, all the windows i have open starts flickering and every time I press any button it flickers again.

1

Problem Solved!

After Changing brightness screen stops flickering if I press Alt + SysRq + r.

http://www.howtogeek.com/119127/use-the-magic-sysrq-key-on-linux-to-fix-frozen-x-servers-cleanly-reboot-and-run-other-low-level-commands/

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