[Bug 93799] New: [BYT] Blank screen on DSI display after drm loads on Teclast X80h tablet

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93799

            Bug ID: 93799
           Summary: [BYT] Blank screen on DSI display after drm loads on
                    Teclast X80h tablet
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: laszlo.fiat at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I can see the boot logo, the grub menu, and first few lines as the kernel
loads, then the built-in screen of the tablet goes blank. Backlight is still
on, but nothing is on the display.

Steps to reproduce the issue: Boot up the tablet without HDMI connected.
How often does the steps listed above trigger the issue: Always
system architecture: x86_64
kernel version: 4.4.0-rc2-next-20151127+
Linux distribution: Debian Testing
Machine or mother board model: Teclast X80h Baytrail tablet
Display connector: DSI (built-in display)

I have one kernel version (4.3.0-rc5-next-20151012+), which actually works
correctly, none of the earlier or later versions I tried works.

I attach the dmesg for both working and non-working kernels.
I can provide more information if needed.

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