[Bug 87578] [dragonflyBSD] Massive display corruption with xf86-video-intel 2.99.917

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87578

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
There are so many potential failures here, that unless DragonFly also has a
comprehensive error capture any guess is likely to be a red herring.

For example, it might be that LLC is comprehensively broken and ignoring it is
the best approach:

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 78ed540..579eb6c 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -70,7 +70,7 @@ search_snoop_cache(struct kgem *kgem, unsigned int num_pages, 
 #define DBG_NO_CREATE2 0
 #define DBG_NO_USERPTR 0
 #define DBG_NO_UNSYNCHRONIZED_USERPTR 0
-#define DBG_NO_LLC 0
+#define DBG_NO_LLC 1
 #define DBG_NO_SEMAPHORES 0
 #define DBG_NO_MADV 0
 #define DBG_NO_UPLOAD_CACHE 0

Or that may just be fixing the symptoms and not the root cause.

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