[Bug 68969] xf86-video-intel 2.99.901 + XMir + multimonitors = all displays black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68969

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #3)
> Chris, can you please provide more info?...
> 
> (a) "xmir_resize() is fubar"; how? So that we might make it less "fu"'d.

Aside from it being a hack around broken drivers, it releases a reference it
did not own.

> (b) "Mir itself is broken wrt to pageflips"; Please elaborate. In the LP bug
> even.

The dmesg is full of incorrect ioctl calls. Then Mir promptly dies after being
told that it did something wrong. And then the races truely begin.

> (c) If 2:2.21.14-4ubuntu3 works, why is it not a bug that 2.99.901 fails?

Your code is broken. If you looked at the traces, you would see that it can't
possibly be doing what you expected. Mir is showing buffers out of sequence
with XMir (during normal usage), and after the modeset XMir is not receiving
the new fd, but continues to render to the previous pair.

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