I noticed that I had the same problem with my MacBook Pro and your packages greatly diminishes the banding. Attached is the Xorg.0.log. The "BWH:" lines are:
...
Set CRTC 0 Source success
BWH: CHIP FAMILY is RV530
BWH: MonType MT_LCD
BWH: Not IS_DCE3_VARIANT
Output LVDS setup success
BWH: ATOM_DEVICE_LCD1_SUPPORT
Output 23 enable success
...
I noticed that I had the same problem with my MacBook Pro and your packages greatly diminishes the banding. Attached is the Xorg.0.log. The "BWH:" lines are:
... LCD1_SUPPORT
Set CRTC 0 Source success
BWH: CHIP FAMILY is RV530
BWH: MonType MT_LCD
BWH: Not IS_DCE3_VARIANT
Output LVDS setup success
BWH: ATOM_DEVICE_
Output 23 enable success
...