[Bug 95414] [SNA HSW] Corruption in OpenGL video output (DRI2 + TearFree)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95414

--- Comment #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
Stick with that kernel and try:

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c642385..9adfe4b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3733,6 +3733,7 @@ struct i915_vma *
                obj->base.read_domains = I915_GEM_DOMAIN_CPU;
                obj->base.write_domain = I915_GEM_DOMAIN_CPU;
        }
+       obj->cache_dirty = true;

        trace_i915_gem_object_change_domain(obj,
                                            old_read_domains,

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