[Bug 89704] New: No image on WinBook TW700 tablet's DSI display after DRM initializes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89704

            Bug ID: 89704
           Summary: No image on WinBook TW700 tablet's DSI display after
                    DRM initializes
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: calcprogrammer1 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I recently bought a WinBook TW-700 tablet for its low price and Intel/amd64
compatibility.  I got Debian installed on a USB drive.  The tablet uses 32-bit
EFI only, no BIOS compatibility mode.  If I boot with nomodeset, the tablet is
usable with no acceleration.  If I boot without nomodeset, the tablet shows the
boot messages up until drm is initialized, and then the screen goes black.  I
can ssh into the tablet (via USB Ethernet) and it seems to think the display is
operational.

I have tried the latest 4.0-rc4 and intel-drm nightly kernels from Ubuntu's
kernel PPA, but both exhibit the same problems.

I will attach dmesg with drm.debug=0xe and the Xorg.0.log after I tried running
xinit from the SSH session.

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