[Bug 111878] External DP monitors blank when using glamor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111878

--- Comment #6 from Matt Roper <matthew.d.roper at intel.com> ---
I don't believe the combination of

        Driver          "intel"

and

        Option          "AccelMethod"   "glamor"

is valid.  If you want to use Glamor you'd also want to comment out the intel
driver line and uncomment the

#       Driver          "modesetting"

line to let the platform-agnostic modesetting DDX manage the Intel displays.  I
believe the modesetting DDX is the preferred driver going forward, although for
HSW both drivers should have support for the platform and it's mostly a distro
decision on which one to use.

Glamor was initially developed by some Intel folks so during its very early
development it was directly part of the Intel DDX, but eventually the glamor
code moved into the Xserver itself.  Since the Intel DDX has its own
specialized acceleration model, it dropped its glamor support in

   commit 0aa2edbd29c8dd26a5f3748e3875c445ea358a6d
   Author: Chris Wilson <chris at chris-wilson.co.uk>
   Date:   Wed Nov 5 11:56:20 2014 +0000

       Remove defunct glamor support

leaving uxa, sna, and noaccel as the acceptable acceleration methods.

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