Does it occur with FBC disabled?
No
Does it occur on the builtin LCD panel?
Yes
Does it occur when only one display is attached (builtin panel or otherwise)?
I only use the builtin LCD panel.
Does it occur with FBC disabled?
No
Does it occur on the builtin LCD panel?
Yes
Does it occur when only one display is attached (builtin panel or otherwise)?
I only use the builtin LCD panel.