https://bugs.freedesktop.org/show_bug.cgi?id=73911
--- Comment #12 from rue ru1812@gmail.com --- Hi I am having the same issue with Banding using the open source Radeon Driver. My laptop is an Acer Acpire 5560G with Radeon HD6520G + 7470M I have tryed a few different Distros and I get the same Banding problems at the moment I have Ubuntu-Gnome 14.04 2.13 kernel and Fedora 20 3.12 Kernel
NOTE: I have noticed the Banding only happens on the built in Laptop Screen if I attach an external Monitor either VGA or HDMI the displays on those monitors are fine, no Banding. Running xwininfo shows my Depth is 24 bit I originally thought that may have been set to 15.
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