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73416ba
(Get the code!)
Yes, I still get tearing in portait mode. It's less noticeable but you can see it when you:
1. Unload plugin "unityshell" to make the UI more responsive.
2. xrotate portait
3. Open a nautilus window, make it narrow and move it left-right (along the axis of the physical scan lines).
Interestingly the tearing is less severe and only occurs near the bottom of the screen on portrait mode. That usually means the compositor is taking too long to render a frame, but it also means the driver is implementing SwapBuffers by a copy instead of page flipping. Fixing the driver to use page flipping is the preferred solution if possible.
Also, all of this is a bit difficult to test because the touch events become very erratic in portrait mode.
(Tested with raring)