[Bug 67846] Using 2 screens impossible again with gen3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67846

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
Unity can only create a fbo as large as GL supports, for gen2/3 this is
2048x2048. In theory, GL was hacked to allow 4096x4096 fbo by forcing software
fallbacks. That however has been broken for a few years, and even when it
supposedly worked it always resulted in rendering corruption. The current
breakage has been reported to hard lock the machine in some cases.

ENOSPC is reported when the command buffer submitted by userspace requires more
video memory than is currently available. (The available memory is reduced by
control structures and pinned surfaces such as the scanout which cannot be
moved, and so the request must fit in around them.) INTEL_DEBUG=all will give a
break down of what exactly failed. This is a bug in the GL driver.

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