[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 #16 from Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> ---
(In reply to Chris Wilson from comment #15)
> (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.

Does it try to go Y tiled when attempting to rotate, in the default build? 

Interestingly in the Y tiled build there seems to be a path where it doesn't
use fb modifiers ("[drm:intel_framebuffer_init] No Y tiling for legacy addfb").

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