[Bug 58911] New: gma500_gfx: Intel GMA600 tries to output to inaccessible MIPI display

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=58911

           Summary: gma500_gfx: Intel GMA600 tries to output to
                    inaccessible MIPI display
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.9.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: khbecker at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No


I'm testing a Versalogic Falcon board (
http://www.versalogic.com/products/ds.asp?productid=230 ) that has Intel GMA600
graphics. This board has SVDO and LVDS display outputs, but only the LVDS
output is accessible. When the gma500_gfx driver loads, I lose the LVDS
display. I see the following message in dmesg:

[drm] internal display is MIPI display

This leads me to believe that the driver is trying to use the SVDO output.

I found a similar issue on the LKML. This email thread included a patch that
includes this board (ID 4108) in IS_MRST. It can be found at
https://lkml.org/lkml/2012/6/12/175 . This patch fixes the issue for me. After
loading the gma500_gfx driver with the patch, the LVDS display output stays on,
I can load X using the modesetting driver and I now see the following in dmesg:

[drm] internal display is LVDS display

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