[Bug 95472] [i915] Feature request: Add support for fencing for PRIME setups

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95472

--- Comment #38 from Chris Wilson <chris at chris-wilson.co.uk> ---
This mesa patch

diff --git a/src/loader/loader_dri3_helper.c b/src/loader/loader_dri3_helper.c
index 99e2897..9be5e72 100644
--- a/src/loader/loader_dri3_helper.c
+++ b/src/loader/loader_dri3_helper.c
@@ -167,7 +167,7 @@ loader_dri3_drawable_init(xcb_connection_t *conn,
    draw->vtable = vtable;
    draw->drawable = drawable;
    draw->dri_screen = dri_screen;
-   draw->is_different_gpu = is_different_gpu;
+   draw->is_different_gpu = true;

    draw->have_back = 0;
    draw->have_fake_front = 0;

will force every client to use the linear shared buffer + local copy. Can you
please test that using DRI_PRIME=0 (i.e. with igfx) and see if it tears?
(Obviously there is still a big difference in drivers that might hide any
issue, as well as any fence now being native...) On the other hand, if it tears
we are closer to finding the right forest.

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