I will raise this issue to Linux i915 kernel team. And hope we can get a clean fix in Linux kernel side finally.
I agree that's a good idea, but given how long it is likely to take, I'd like to at least give a clear user-friendly error in the meantime.
-Is it likely that "drm_intel_gem_bo_context_exec() failed: Invalid argument" (since 9e8874c) affects _all_ Haswell hardware? If so, I'd consider this an improvement over the previous "some work (as long as you don't use __local), some silently do nothing", and put the i915_cmd_parser workaround in the error message.
-What happens when you do try to use __local (without https://01.org/zh/beignet/downloads/linux-kernel-patch-hsw-support): an explicit error, or wrong results?
-It was suggested some time ago that i915.enable_ppgtt=2 might help; does it? (This kernel parameter can only be set at boot time, and is an "unsafe parameter" i.e. "may crash your system", but would be easier than recompiling Linux.)
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