This is a regression from CentOS 7.3. The symptom appeared after upgrading from CentOS 7.3.
I'm not sure if the problem lies with gnome or the driver, but any help would be appreciated.
System is a Dell Optiplex 790 with a dual-headed ATI RADEON HD 5450 driving two 23" 1920x1080 monitors.
The desktop displays fine when in landscape mode. The display becomes garbled when portrait mode (rotate left) is selected via the gnome display manager.
A similar system with a dual headed ATI Radeon HD 3450, also driving two 23" 1920x1080 monitors, is able to display just fine in both landscape and portrait mode.
Issues related to hardware problems
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