[PATCH] drm/i915: fix corruptions on i8xx due to relaxed fencing

Daniel Vetter daniel at ffwll.ch
Wed Mar 9 23:52:34 PST 2011

Am Do, 10.03.2011, 06:06 schrieb Indan Zupancic:
> This isn't in rc8, can someone make sure it gets into 2.6.38-rc9/2.6.38?

The patch unfortunately broke gen4+ (more precisely: the unwritten abi
guarantee that userspace can tile buffers that don't have a complete last
tile row, as long as it promises not to touch it). Hence it got reverted.
It was just a enforcement check to prevent broken userspace from fooling
itself. The proper fix is to upgrade your userspace (libdrm +

[Aside: This only happens if you have new enough userspace that supports
relaxed tiling. Old userspace and new kernels are _not_ broken.]

Cheers, Daniel

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