SleepEx(6,false) was sufficient to make problem go away on HD 4600 in a 4770S CPU. Needed as much SleepEx(15,false) to make problem go away on HD 4400 in a 4210U CPU. (Latter is almost a full frame delay at 60 Hz refresh.) Is it known where what root problem is (my code, driver, DirectX, or OS)?
- Arch