[Bug 98467] New: Baytrail MIPI/DSI Black screen when boot with HDMI connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98467

            Bug ID: 98467
           Summary: Baytrail MIPI/DSI Black screen when boot with HDMI
                    connected
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: fabianpie at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127581
  --> https://bugs.freedesktop.org/attachment.cgi?id=127581&action=edit
dmesg with drm.debug=14 with and without error and i915_vbt

I'm testing a Baytrail device with mipi/dsi display and hdmi output. 
When I boot without the hdmi connected the mipi/dsi works OK and after
connecting the hdmi both mipi/dsi and hdmi display graphics OK. (attached
dmesg-mipi-ok.txt)
If I boot with the hdmi connected it's selected by the bios as the default
display, Ubuntu only boots in hdmi and it works OK in this display but MIPI/DSI
is black. It's listed as connected by xrandr but I can't reset in any
way.(attached dmesg-mipi-error.txt)
I'm using Ubuntu 16.10 with kernel 4.8.4
Also attached /sys/kernel/debug/dri/0/i915_vbt in zip
BR.
Fabian

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