[Bug 32934] [ILK switchable] External monitor (connected via docking station) stays black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32934

--- Comment #50 from Jesse Barnes <jbarnes at virtuousgeek.org> ---
In the dump from comment #48, are both displays up and working with i915
disabled?

If so, we may be hitting what I was afraid of, since the second pipe appears to
be off:

--- i915 disabled
+++ i915 enabled

-                      DSPBCNTR: 0x00000000 (disabled)
-                      DSPBBASE: 0x00000000
-                    DSPBSTRIDE: 0x00000000 (0)
-                      DSPBSURF: 0x00000000
-                   DSPBTILEOFF: 0x00000000 (0, 0)
+                      DSPBCNTR: 0xd8004400 (enabled)
+                      DSPBBASE: 0xffff6680
+                    DSPBSTRIDE: 0x00002c00 (176)
+                      DSPBSURF: 0x0a02e000
+                   DSPBTILEOFF: 0x00000020 (32, 0)

i.e. when we load i915, it tries to use pipe b to light up the screen, but it
doesn't work.  Even the HDMI is disabled:

-                         HDMIC: 0x0000001c (disabled pipe A 8bpc SDVO DVI
audio disabled +vsync +hsync detected)
+                         HDMIC: 0xc000001c (enabled pipe C 8bpc SDVO DVI audio
disabled +vsync +hsync detected)

So this may be a case of 'not our bug', or at least not solely, since it means
we need the switchable graphics handling support to work.

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