[Bug 67906] [ivb 3 pipe regression] Identical HDMI outputs don't share PCH PLL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67906

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
Robust? More like doesn't commit suicide.

SNA will install a minimal configuration if the intial modeset fails in:

commit 986e13a56a8544d5b32dbcaacbc0ee9cf5d47e27 [2.20.16]
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Dec 10 17:29:08 2012 +0000

    sna: Try installing a fallback config on VT enter in case full desiredMode
fails

X tries to not wimp out in:

commit 6703a7c7cf1a349c137e247a0c8eb462ff7b07be [xorg-server-1.13.99.902]
Author: Keith Packard <keithp at keithp.com>
Date:   Tue Jan 8 20:24:32 2013 -0800

    hw/xfree86: Require only one working CRTC to start the server.

Also note that if you are using SNA, it will try to maintain the exact setup it
inherits from fbcon before the DE take over.

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