[Bug 91562] [SKL][Linux] : Xrandr is not working as expected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91562

--- Comment #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Tvrtko Ursulin from comment #14)
> Created attachment 118122 [details]
> ddx debug log in Y tiling mode
> 
> With the DDX rebuilt to default to Y tiling, this logs shows that when
> "xrandr -o left" it abandons the Y tiled FB and goes back to X tiled.

It sets the rotation, and then the kernel rejects the setcrtc and so it is
forced to use a shadowfb, X without rotation, and perform manual rotations
(using the GPU of course!) from the Y-tiled frontbuffer to the X-tiled
framebuffer.

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